The most comprehensive method of ensuring security it involves removing the existing lock from the door including the handle if it s a handle lock combo and then installing.
How to replace door lock.
You may also need to use a wire tool or a paper clip.
Use a phillips head screwdriver to unfasten the two or three screws located on the inside knob plate.
Begin by removing the screws from the door knob on the interior side of your door.
Then remove each side s door knob by pulling them away from the door.
Remove the screws from the old lock on the inside of the door.
Once the new pins are in reverse the steps to reassemble the lock.
Remove the two screws from the latch plate on the edge of the door and remove the latch from the opening.