That would actually be cheaper 🤔 I was thinking more like the key systems where one key (Hers) can unlock multiple locks, while each lucky bastard has his own emergency key that unlocks only his lock. Or She could have deputies that would have a key that would unlock a subset of locks, like maybe some local gal (student, having this as a kinky summer job, paid by lockees...no I wasn't thinking too deeply about this scenario, why do you ask?) that would oversee/perform the cleaning.