My friend began to hit the enter key too hard. But when I mean hard, is like trying to put all your anger into it. It still works and all but I am afraid that it might get affected in the long run. Specially because the enter key seems to be soft. Should I be worried? Are macbook pro keyboards resistant to these kind of hard-hits? In the worst scenario... What happens if one of the keys is damaged? Can the key mechanism be replaced easily in any repair store?