Next put a new latch in and replace the door knob.
How to change door lock keys.
To change the lock on a regular door knob first use a screwdriver to remove the door knob and the old latch.
Alternatively you can buy a re keying kit for the lock you already have.
Measure the diameter of the holes currently cut out of your door so you can select a new door lock that fits those dimensions.
Take care to measure carefully as matching the size can be especially problematic in older homes.
Once you have the kit remove the lock cylinder from the door knob so you can change the pins inside.
Before you learn how to change door locks measure the space where you ll install the replacement.
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I don t recommend the you change it locks too many ways to screw them up.
If you have a window in or next to the door a lock with key cylinders on both sides is preferable as long as local codes allow and you keep a key within reach.
If your house keys are ever stolen one of your first orders of business is changing the locks on your doors so no one can gain access.
How to re key a door lock change your locks yourself by removing the lock cylinder and changing the pins.
Having the combination changed is more affordable.