1.  Drago unlocked the door at the top of the stairs, and led the way into a high narrow storeroom.

2.  Emily unlocked the door and moved into the cool of the hallway, putting down her bag gratefully.

3.  Half way down the corridor he unlocks a door, pushes it open and turns on the light.

4.  He fumbled to unclip the keys from his belt and his fingers were trembling as he tried to unlock the door.

5.  He took out a huge bunch of keys and unlocked the door.

6.  He unlocked the door and peered out into the darkness.

7.  I unlocked the door and went in and lay face down on the bed.

8.  I unlocked the door of the apartment and found that Edusha was still awake.

9.  It is merely a key which unlocks a door.