In the group zone there should only be 2 doors that are 'locked' until special needs are met.
The first one at the bottom of the stairs, there is a named mob that you must activate and kill, by doing the ring event in his room.
The next set, I beleive a few rooms later, requires either a key or switch to be activated in one of the nearby rooms.
____________________________ Things I sometimes play...
"What do you want to be when you grow up?"
"I want to be a unicorn!"
"Awww, why's that?"........
"So I can stab people with my face."