Description: Glass door is opened and closed, dead bolt locks. Open, Close Glass Door Lock, Dead Bolt.

Description: Glass door is opened and closed, dead bolt locks. Open, Close Glass Door Lock, Dead Bolt.

Description: Glass door is opened and closed, dead bolt locks. Open, Close Glass Door Lock, Dead Bolt.

Description: Glass door is opened and closed, dead bolt locks. Open, Close Glass Door Lock, Dead Bolt.

Description: door to a cement stairway closing.

Description: an apartment stairway door opening.

Description: door knob opening, followed by door closing.

Description: inside doorknob opening quickly.

Description: inside doorknob opening quickly.