The audio begins with the distinct sound of a key being inserted into a lock. The metallic rasp echoes in the quiet with a sense of purpose. Next, there's a slight pause, a moment of suspense before the key is turned. The tumblers within the lock shift with a satisfying clunk, indicating that the lock is now engaged. The final sound is the key being withdrawn, a metal-on-metal scrape that signals the completion of the process. The door is now securely locked, the key's job done. The audio ends, leaving behind a lingering sense of security and finality.