<human>: Can you succinctly summarize the text in 1-3 sentences?

I recently got locked out of my apartment late at night coming home from a party. I left my keys in the apartment and neither of my roommates were home, luckily it wasn't deadbolted so I broke in using a credit card. My roommates were pissed I felt stupid but I was drunk and tired. 

Anyway today my roommate breaks his key off in the lock, and has to call a locksmith in order to get it out. He's trying to get me to pay the locksmith fee because he says his key broke because I had to break into the apartment. 

So my question is, is that really the reason? Would me breaking into my apartment using a credit card cause something to happen to the lock to break off the key? Or was it just because his key was old and or defective in some way? I just want to make sure either I'm paying part or the whole thing rather not pay for all of it.
<bot>: Locked out of my apartment broke in using a credit card, couple days late roommate breaks key in lock calls locksmith trying to get me to pay for locksmith. Faulty Key? Or my doing?