How do you remove a key cylinder without a key?

To remove a key cylinder without a key, first ensure the door is unlocked. Use a screwdriver to remove any screws securing the cylinder to the door. If the cylinder has a small pinhole or slot, insert a paperclip or flathead screwdriver to depress the retaining pin while pulling the cylinder out. If necessary, a lock-picking tool can also be used to manipulate the internal mechanism.