Unscrew this plate and remove the latch from the door if possible.
How to change door lock cylinder without key.
The pin springs top pins and bottom pins all make up how the lock works.
When the key is aligned and removed the pin springs push the top and bottom pins down locking the cylinder in place.
Look for a small set screw at the base of the handle.
Prop open the door as you change the lock.
Remove this screw using a drill or screwdriver.
Insert another flathead screwdriver under the edges of the tabs holding the lock cylinder in place within the housing.
Open the door and look for the latch plate along the door s edge.
Insert a flatheaded screwdriver into the spindle housing hole.
How to remove a door lock without a key.