Why Is My Door Lock Not Working or Not Locking?
Most door locks that stop working have one of four causes: the door and strike plate no longer line up, the mechanism is dirty or dry, the key or cylinder is worn, or a keypad lock has weak batteries. Work through them in that order, starting with the free checks. If the lock is old, worn or damaged, replacing it is often simpler than repeated repairs.
TEEHO TE001Best overall
Estmoon Most keys included
Gobrico 12061-01Lightest listed weightStart with the quick checks
Before you take anything apart, rule out the simple causes. These take a few minutes and solve a surprising share of lock complaints.
Try the lock with the door open, then closed. That one test tells you whether the lock itself is the problem or whether the door and frame are the problem.
- Turn the thumb turn or key with the door open. If the bolt slides in and out smoothly, the lock is probably fine and the issue is alignment.
- Look at the bolt when it is extended. It should be straight and move freely, with no grinding.
- Check that the key is the right one and is not bent, cracked or badly worn.
- On a keypad or smart lock, replace the batteries before anything else.
- Look for loose screws on the lock body, the handle and the strike plate.
Why the door will not lock: alignment problems
If the lock works with the door open but the bolt will not go into the frame, the bolt and the hole it enters no longer meet. Wood swells and shrinks with the seasons, hinge screws loosen, and houses settle. Any of these can shift the door by a small amount, and that is enough to stop a bolt.
Close the door and look at where the latch and deadbolt meet the strike plate. Rub a little lipstick or dry-erase marker on the end of the bolt, then turn it so it touches the frame. The mark shows where the bolt lands compared with the hole.
Tighten every hinge screw first. A sagging door often fixes itself with this step alone. If a screw spins without gripping, remove it, fill the hole with a wooden toothpick or dowel and wood glue, let it dry, then drive the screw back in.
If the bolt still misses by a little, enlarge the strike plate hole slightly with a file or move the plate. If it misses by a lot, the hinges may be set too shallow, so the door is binding against the frame. That is a bigger repair and may call for a carpenter.
Why the lock sticks or feels stuck
A lock that feels stiff, gritty or jammed is usually dirty, dry or worn. Dust, grit and old oil build up inside the cylinder, and cold weather can make things worse.
Start by working out where the stiffness is. If the key goes in hard, the problem is in the cylinder. If the key turns but the bolt drags, the problem is in the bolt or the alignment. If the thumb turn is stiff from inside, the problem is usually the bolt rubbing on the frame.
- Blow dust out of the keyway with a can of compressed air.
- Use a dry graphite or PTFE-based lock lubricant in the keyway. Skip heavy oils, which attract dirt and turn gummy over time.
- Wipe the bolt and latch clean, then add a thin film of lubricant to the moving edge.
- Try a spare key. If the spare works, your main key is worn.
- Never force a key. A key that snaps inside the cylinder turns a small problem into a larger one.
Keypad and smart lock problems
Electronic locks add a few new causes. The most common one is low power. As an example from our data, the TEEHO TE001 runs on 4 AA batteries and shows a red light when the battery level drops below 15%. The Veise VE017 also uses 4 AA batteries and has a USB-C emergency port, so you can power it up if the batteries run flat.
Use fresh, matching batteries and make sure the contacts are clean and seated. Mixing old and new cells can cause odd behavior even when each cell tests fine.
Next, check the auto-lock setting. On the TEEHO, auto-lock can be set to 10 to 99 seconds and is off by default. If you expected the door to lock itself, confirm the feature is switched on. Also check that the door closes fully, because many electronic locks will not throw the bolt if the door is not seated against the frame.
If the keypad is unresponsive, clean it with a dry cloth and check for moisture. If a smart lock misbehaves with its app, review the settings there and keep the mechanical key somewhere you can reach it.
Symptom and fix at a glance
Use this table to match what you see with the most likely cause.
| Symptom | Likely cause | What to try |
|---|---|---|
| Bolt will not enter the frame | Door or strike plate out of line | Tighten hinges, adjust or file the strike plate |
| Key goes in hard | Dirt or dry cylinder | Compressed air, then dry lubricant |
| Key turns but bolt drags | Bolt rubbing on the frame | Check alignment, lubricate the bolt |
| Key will not turn at all | Worn key or worn cylinder | Try a spare key, then replace the cylinder |
| Keypad does not respond | Weak batteries or dirty contacts | Fresh batteries, clean the contacts |
| Lock does not engage by itself | Auto-lock off or door not closed fully | Check the setting, check door seating |
When to replace the lock
Some locks are simply worn out. If the cylinder is loose, the bolt is bent, the key wears quickly or the lock fails again soon after cleaning, a new set is the better fix.
When you shop, measure your door first. Many sets on our best door lock page fit doors 1.375 to 1.75 in thick with a 2.375 to 2.75 in backset, such as the Estmoon set. Some locks need a 2-1/8 in bore hole, and the TEEHO does not fit a 38mm hole. A lock that does not match your door will cause the same sticking and misalignment problems you are trying to fix.
Also check the basics of the lock itself. Look for an included deadbolt, since the deadbolt does most of the work of keeping a door shut. Most products on the page list ANSI Grade 3, and cycle ratings, where listed, show how many lock and unlock operations the mechanism was rated for. You can compare these numbers side by side on our door lock comparison.
Safety notes
Keep the door secure while you work. If you must leave a door unlocked during repairs, do not leave the home unattended.
Wear safety glasses when you chisel a hinge mortise, drive screws into old wood or spray lubricant near your face. Wood chips and spray can both hurt your eyes. Keep fingers clear of the bolt when you turn it by hand.
If you cannot get into your home or the lock is jammed shut, stop forcing it and call a locksmith rather than drilling or prying.
Frequently asked questions
Can cold weather make a lock stop working?
Yes. Cold can thicken old lubricant and make parts stiffer, and moisture can freeze in the keyway. Use a dry lubricant and let the lock warm up rather than forcing the key.
Is it safe to spray WD-40 into a lock?
It can free a stuck lock for a short time, but it can also leave a sticky residue that collects dust. A dry graphite or PTFE lock lubricant is the better long-term choice.
Should I replace just the cylinder or the whole lock?
If only the key action is bad and the rest of the lock works, replacing the cylinder may be enough. If the bolt, latch or handle is damaged, replace the whole set.
Why does my lock work in summer but not in winter, or the other way around?
Wood doors and frames swell and shrink with humidity and temperature. That can shift the bolt just enough to miss the strike plate, so seasonal alignment changes are common.