Loot the chests, then go through the newly unlocked door. Before entering it, though, head through the secret door and you’ll find a room with more statues and some treasure chests. Inspect the hole and the other door will unlock. It also reveals a hole in the wall near the locked door. Clear the rubble in one corner of the room, then step on the slab underneath to reveal a secret door behind you. There’s an electrical trap in this room, but you can disable it by pushing a statue onto it.
