Heyo, got also stuck at the ruin myself (hitting 2 keys at same time wasn't obvious, nor that those blocks are pushable in all instances in the ruins).
Why not have a cutscene after we see the gobu exit the entrance room where MC push by mistake a bloc which open the 2 sides doors (with a prompt after the cutscene indication the key combination for it).
I know that dumb it down a bit, but if many people have this problem, it might be a solution.