Locks/Warnings for private residences

[Segreti]

It's too easy to accidentally enter a private residence as a human without realizing what it is. This can cause problems of stepping on traps, or IC fights like happened with Segreti (Though I very much enjoyed it). I think there should be some kind of lock, or at least a warning kind of like the one you get when trying to attack cops. Doesn't need to be something hard. Just enough of one that it prevents someone accidentally going somewhere they shouldn't.

Course if some kind of lock, like the ones that are attached to the grid B&E buildings is an option. That could also be an interesting way to do it.