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"I bet we're supposed to catch the key," Sally-Anne said. "There is just one broom though. Unless you've got yours shrunk somewhere, Harry."

Lavender bent down to look at the lock closer. It was a rather old lock, by her judgement, with a classic keyhole opening for the lock, much larger than many modern keyholes. It was bigger than the one that Fred and George had been working on.

"Good idea, too bad I didn't think of it," Harry said. "Any objection to my making an attempt with this broom to find the right one?"

Lavender pulled out the rods she used to work on the ships in a bottle that she did for a hobby from where she kept them up her sleeves. They were much better than what she had used before she got to Hogwarts. They could push and pull, hold and release, all with just the intent of her mind. They had been a gift from Professor McGonagall. It wasn't the only thing she knew how to do with them. Ron's older brothers could be so helpful if you knew how to, and which one to ask. And had something to offer in turn, like for instance a powder combination that turns skin blue.

"There are hundreds of them," Dean said. "You'll never find the right one."

"It probably has a broken wing from whoever went before us, or at least damaged," Hermione said. "It may have even been the one that Harry swatted. Looking at the lock, it's probably rather large and ornate..."

"Or I can just pick the lock," Lavender said as she made one last probe with her pick. The door opened. Sometimes Hermione over thought solutions.

"Or that," Hermione concluded.

http://www.fanfiction.net/s/8631152/9/