NOTE: If you're playing the demo version of the game, skip this section and go on to Part 4. There are no rewards, so there's no need to do anything else here. The demo finishes after you leave this room.
In the full game there are 2 hidden rewards here, both gold and silver. To get one of them, you'll need to fiddle with the door mechanism a bit more.
NOTE: If the door opens too far, you won't be able to reach the gold reward in the alcove above the exit, so you'll have to start over: Close the door again by dragging the cage off the center pad and stepping on the left pad. Then repeat the steps above, pushing the cage onto the center pad and standing on the left pad just until the door is positioned correctly.