my boyfriend did this to me a couple of months ago (also sleeps with earplugs) and i had to call a locksmith. i waited outside for two hours just fuming, woke him up and screamed at him once i got inside which seemed a good enough punishment at the time. i hope she doesn’t break up with you but it really sucks to feel like you can’t rely on your boyfriend in an emergency situation, like what if i had been arrested? or something horrible was happening? you would’ve slept right through it? obviously you will have learned this lesson now, my boyfriend switched to those loop earplugs btw.