Sorry, there is no FOTL for Harry Potter and the Forbidden Journey with your room key. You can enter WWoHP one hour before the park opens if you are staying onsite, but that is it. You still have to wait in the regular line (or the single rider line) for the ride. There is no Express line, and I did not see anyone scanning room keys while I was there.
There is also no Express line for the Ollivander's show.
You can use your room card to get Express/FOTL access for Dragon Challenge and Flight of the Hippogriff in WWoHP.
You could call Guest Services and ask if this is included in any of the VIP tours, but those are very expensive and I'm not sure FJ is included there either.