Interior Door Key

thingiverse

This innovative design unlocks interior house doors without needing a specialized key, relying instead on the humble coin. Typically, coins are employed to unlock these doors, but one can now opt for a tiny key that fits neatly atop the door frame, functioning flawlessly in place of a coin. Update: A file has been added featuring a keychain hole, allowing users to attach this compact key to their key ring with ease.