Much like the handicapped, drunk people need special help. Bars on a restroom stall, so they won’t fall in, etc. Unlike handicapped people, their impairment will pass after a night full of puking, stumbling and people laughing at them.
One thing we can do to help these common-sense impaired numbskulls is to make it easier for them to get into their home and away from the rest of us. That’s where this keyhole comes in handy. It would be hard for anyone to miss the keyhole with a device like this on your door.