One of the (few) advantages of living in a military Officers' Mess is that we do not need to lock our rooms. In the event of returning late and 'tired' , and forgetting the combination to the front door, or being incapable of operating same, a bell is provided so the Mess staff will let you in. A few years ago I shared, with 3 others, a fantastic batman called Charlie, who was a positive Jeeves. He would come in at 0700 bearing tea. If he saw the signs of a long night in the bar, he would return 15 minutes later to ensure I was awake, inform me that the shower was running, and make sure my uniform was ready when I emerged from the bathroom. Alas, they don't make them like that any more.... So there you are, key problem solved. Join the military, or employ a valet..