A jammed lock usually gives some warning first: a key that catches, a door you have to pull hard to lock, a latch that drags. Then one day it doesn't move at all. Here's how to work out what's wrong and what to try, without making it worse.
What exactly is stuck?
| What happens | Likely cause | Try this |
|---|---|---|
| Key goes in but won't turn | Bolt rubbing on the frame, a worn key, or dirt in the lock | Push or pull the door firmly towards the frame while turning. Try a spare key. |
| Key won't go in fully | Wrong key, dirt or damage in the keyhole | Check it's the right key. Don't hammer it in. |
| Lock turns but the door won't open | Latch or bolt stuck, or a broken part inside the lock | Wiggle the handle while pushing and pulling the door. Don't force it. |
| Door won't lock any more | Door has dropped, so the bolt doesn't line up with the hole in the frame | Lift the door slightly by the handle while locking. |
| Digital lock beeps but won't open | Weak batteries or a jammed motor | See digital lock battery dead. |
Why locks jam in Singapore
- Humidity and rain. Gate locks and corridor-facing doors take the most weather, and rust builds up inside.
- Doors that drop or swell. Hinges wear and wooden doors swell in humid weather, so the bolt starts rubbing on the frame.
- Worn keys and locks. A key that's been copied from a copy, or a lock that's been used daily for many years.
- Slamming. Gates and doors that are slammed shut knock lock parts out of line.
Safe things to try
- Take the pressure off the bolt: push or pull the door towards the frame, or lift it slightly by the handle, while turning the key.
- Try the spare key. If the spare works, your main key is worn.
- Use a lubricant made for locks, such as a dry graphite or PTFE lock spray, in the keyhole. Avoid cooking oil, which gums up the lock.
- Turn gently. If it doesn't move with normal hand pressure, stop.
What not to do
- Don't use pliers or force the key. Keys snap inside locks, which turns a jam into a bigger job. If it has already happened, see broken key extraction.
- Don't kick the door. HDB main doors are often fire-rated, and a damaged door or frame is expensive to put right.
When to call
If you're locked out, locked in, or the lock won't turn with gentle pressure, call or WhatsApp 9224 9224, 24/7. We open the door, damage-free wherever possible, and replace the jammed lock in the same visit if it's worn out. We don't repair locks: a new lock is more reliable and comes with our no-expiry warranty. See HDB main door lock replacement and HDB gate lock replacement.
Lock jammed? Don't force it. Call or WhatsApp 9224 9224, 24/7.