Qaz had good luck the first time, so she thought that she'd try again.

Pointing her wand at the chest, with a flick, she said, 'Alohomora' Once again, the lock opened. 'Geez, I'm really starting to get better at this wand stuff.'

Still, Muggles had much more exciting ways to do this....pick the lock, blow it up, etc....but with magic, you'd never know the lock was compromised....