Abstract: A door lock includes a latch bolt assembly, and two rotary knobs connected to the latch bolt assembly. A press key is incorporated in one of the handle members and a key-operated lock is incorporated into the other knob. A clutch member is employed to connect and disconnect the latch bolt assembly to and from an actuating member which can engage with and disengage from a locking plate of the lock. The actuating member disengages from the clutch member and engages with the locking plate when the press key is depressed. When the lock is operated by a key, the actuating member is released from the locking plate and engages again with the clutch member.