If you are from the 90's, of course you remember being a 11 year old kid waiting for the letter from Hogwarts! We all wanted to be wizards like Harry Potter and fight the bad guys. Hermione was considered one of the smartest witches of her age and she was a loyal friend who sticked with Harry until the very end. I would feel really safe if I had the clever Hermione by my side everyday - In this case, protecting my keys. Wouldn't you?