I think you really need to be careful with random map design. It should always be obvious how the map works: Like a random wall placement, but you don't have to investigate the wall in any way, because of this the random locking of doors are ( to me ) a bad idea. This because we must always be very observant of what is a cool feature for a mapper, and what is a cool feature for a player. And beeing forced to try out doors every time you play a map is not fun for any length of time.
Because of this I would not lock doors at random. Instead I would place the door at random places.
But this is only if the doors are a main route in the map, if its a less important place in the map: it WOULD be cool (and realistic) with randomly locked doors.
What am I jabbering about? I guess just the fact that us mappers often do features that are cool because they are cool, not because it makes the map more fun to play...
