Quest 'Get Junior': No other way to open the wall to a secret stash?
Solution 1:
I found that the activation point for the torch on the right was tiny, and hard to hit naturally.
I would suggest angling your camera as far up as possible, and "scanning" the torch area. You should find an usable area, which will open the door.
For a criminal enterprise / betting arena, I found the amount of cash on hand to be very disappointing. ;)