:P I had this same problem but they told me you have to fight a boss to get the key to move the lever . . . when you start keep going straight and then go to your right the boss should located their when you go inside the shrine
Now, when you enter read the dialog for the quest that it automaticly gives to you when you start the dungeon. It should say that you must defeat a boss in order to proceed. Look on your map and go to the temple that is NOT after the gate. If you had anymore trouble just post back to this forum and I will try to give further assistance.