So I can assign the room to them? All I want is for them to enter the room so I can lock it. I have not yet gained a hatred against nobles, but I've read enough that I want to do what I think is best for my fortress.
Well, if all you want is to get them into a room, build them a lever, set its (P)rofile so that only that noble can use it, and then order it pulled repeatedly. (Because pulling levers is just about the only thing nobles are good for.)
If fortress well-being is your standard, though, you might want to contain them indefinitely instead of offing them as they come (channel a hole in the ceiling of their room, put a food stockpile on the tile below it and a dump zone directly over it, then designate occasional food and booze dumps).
For one thing, you always get replacement nobles, and you very well might get a noble that's worse, but regardless you have to go through the whole business of locking them in there again. For another, without a Captain of the Guard there are no hammerings (nor cagings/chainings/beatings), so if you haven't appointed one you can simply ignore the pretentious bastards. (This may be considered a bug, and therefore liable to get a fixin' soon.) Or if you
have a Captain, you can designate your Hammerer's hammer for dumping (apparently this makes them unhappy though?), and whenever someone gets lined up for a hammering, draft them and set their armor level to plate (assuming of course that you've got a steel plate suit kicking about). Unless I'm very much mistaken (and excluding egregious circumstances) this should ensure your dwarves survive the enforcing of "justice".