The four of them, more-or-less unharmed, headed onward. Cautiously stepping through a door, the Weasleys found themselves faced with an odd sight: a broomstick lying abandoned on the floor, and a bunch of fluttering winged keys of myriad colours, and a great ornate door on the opposing side of the room. Fred and George skittered across the room, emboldened when they were not attacked. "Alohomora!" said Fred, tapping the lock, and then George pulled on the door. It remained firmly locked. He shrugged. "Worth a try."