The footsteps get closer and closer. Finally, you hear them just on the other side of the door. Everything on this side is completely silent, as everyone is tense with anticipation.
The door handle moves a bit, as someone on the other side touches it. You hear a faint beep, probably a key card of some sort being swiped, and then a loud click as the door is unlocked.
Moments pass and the door remains closed. Then you hear footsteps again, slower and more deliberate this time, growing fainter as someone on the other side moves away from the now unlocked door.
The door handle moves a bit, as someone on the other side touches it. You hear a faint beep, probably a key card of some sort being swiped, and then a loud click as the door is unlocked.
Moments pass and the door remains closed. Then you hear footsteps again, slower and more deliberate this time, growing fainter as someone on the other side moves away from the now unlocked door.