Abstract: A key-actuated security entry system for an inwardly opening door to prevent unauthorized opening of the door. The system includes a pivotal, floor-engaging doorstop mounted on the door inside surface near its base, a key-actuated tumbler lock mounted through the door, preferably below the doorknob handle, the lock including a rotatable shaft protruding from the inside lock housing surface, and a cable connected to the shaft and the pivotal doorstop. The shaft includes a rachet lock requiring a proper key to disengage the shaft from the lock housing to permit shaft rotation by the key. Shaft rotation lifts the doorstop permitting entry through the doorway.