What significance do the following objects have in Part One of the book? What do they tell about the characters or storyline?

Ms. Petosa has combination locks for the kids. She explains that she'll take attendance and then distribute locks, and says that the students aren't to try to open them yet. Auggie has no problem unlocking his lock. This shows he has skills other kids lack.Auggie also shows sympathy to Harry who can't open his.