Lubricate the moving components with graphite then replace any broken parts and reassemble the lock.
Home front door lock wont unlock at all.
If that is the problem it is easy to fix.
Spray the door key with a graphite based lubricant.
Misaligned deadbolts and latches are common door lock problems.
Flip the key and open the door.
The same solutions apply to when you are solving the issue with most broken locks.
If the key turns but doesn t unlock the lock disassemble the lock so that you can be sure the cam or tang is properly engaged with the bolt.
Don t use a wet.
If the malfunctioning lock is in the door handle there will be at least two screws securing the door handle to the door.
You can spray a little dry lubricant in the lock to free up the plug so you can open the door.
Outdoor locks can collect a lot of dirt and dust inside the lock cylinder.
That can cause the pins to get stuck in a partially raised position and prevent the plug from turning.
This video shows how to disassemble and lubricate a basic cylindrical doorknob.
A strike plate is usually affixed to the door jamb and facilitates the extension of the bolt or latch.
In most cases it means that the latch or locking bolt are not lining up with the door locks strike plate.
Slide the key in the lock and tap lightly on the key to lubricate the inside of the lock.
Locate the screws holding the lock in place on the inside of the door.
Remove the old lock.