Fitz suggests that after all the noise made attempting to open the door, that two others help him (see the new rules in the Rules and Procedures sticky thread. I have also given dwarves the same secret door rules that elves have (notice something when passing by on a 1-2, find when searching 1-4).
Ruby wanders back from the secret door she found and helps open the one into the 10' square. The door easily opens with three hefty (or not so hefty) shoulders put into it. Inside, you find an 8'x8' room filled with a mish mash heap of weapons and trash.
BTW, you have two more turns before you have to rest again. It will take a turn to search the room.