Every once in a while someone in group maybe even you may not be able to go through the door after killing Lady Org. If this happens don't panic, two easy fixes that generally work are:
1) have person turn and sprint back to the room where Lady and Sir were and then run back
2)If that doesn't work, have person pull aggro from last room right before the door and then drag aggro with them to right before the door and let the aggro kill them. After player dies have them rezzed through the door.
Now remember while this player is working on taking care of the bug your group should still be working on taking care of and clearing first room because of the timer.