In the Forelhost Refectory, if the player runs back into the room where the http://elderscrolls.wikia.com/wiki/Glass_Claw was originally found while fighting http://elderscrolls.wikia.com/wiki/Rahgot, the barred doorway may close after entering. If so, an object placed on the pressure plate where the Glass Claw was originally found should open the door.
Elderscrolls Wikia - http://elderscrolls.wikia.com/wiki/Forelhost