So you basically want to throw a fire ball at the dark looking box which will it lights up and you will hear some type of elevator ding sound telling you that you have opened it. It's probably the filter I'm using, but if you press 0 you can off the filter to see the color of the light above the elevator door which indicates if the elevator is opened or not.
With all that being said, I will try to find a better way to show what needs to be done.