The sound of a bunch of keys opening the door.

Five versions:

1. Keys Locking Door 1 (0:02)

2. Keys Locking Door 2 (0:04)

3. Keys Locking Door 3 (0:02)

4. Keys Locking Door 4 (0:03)

5. Keys Locking Door 5 (0:02)

You get an archive with wav and mp3 files.