On one of mine, it’s 90° to unlock all, 180° to only unlock the top middle.
But seriously, is it new to you, or did it suddenly start acting up? If a recent occurrence, maybe the bar that goes to the back of the box is disconnected. Most of these boxes rely on gravity to lock, so turning it upside down might unlock it. But only if you’ve exhausted all other options, cuz the mess could be fantastic. Once unlocked, pull each drawe open an inch, flip it back over, and the mess might be smaller.