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