HOW TO REMOVE A BROKEN KEY IN A LOCK – Oh no, you’ve snapped the key off in the lock! Does this mean having to call out a locksmith and fit a new lock? – Well maybe not… This guide below will show you a number of ways you might be able to remove the broken piece of the key from the door lock.
Step 1
Take a can of WD40, or other similar lubricant. WD40 comes with a long flexible hose attachment, so place this as far as you can in the key hole and squirt in a good amount of the WD40.
Step 2
Leave for about 5 minutes to allow the lock to become well lubricated.
Step 3
From the other side of the door, take a rubber mallet and strike the lock sharply. This can cause the broken key to pop out. DO NOT use a regular steel hammer as this will cause damage to the lock and even your door. Did this work? No? Try the next step.
Before we leave I know what you are thinking… How can you strike the lock from the other side of the door if you are locked out? Well this step does assume that you can get in via another door 
Step 4
Apply a very small amount of super-glue on the other half of the key. Insert this into the lock and onto the other half of the key. Leave for a minute and then pull out gently. Note this is a tricky one as you will need steady hands. If you get this wrong then you could end up causing yourself more issues. It is worth trying as if you can’t get the key out then the lock is useless anyway.
Step 5
If the above does not work, take some needle pliers and see if you can insert these into the lock and grab the broken key.
Step 6
LAST RESORT…. If you have been unable to remove the key, then either change the lock or call out a locksmith – it would probably be cheaper just to change the lock.
