Why is the blackberry headphone jack sometimes locked? How do you unlock it? (or is it just broken?)

This is the second time now that I haven’t been able to fit a headphone into the headphone jack. Usually, it just slides in no problems. But a week after I got the phone, I had this issue where I just couldn’t fit a headphone into the jack.. then the next day it was working again and hasn’t been a problem again until today.

It looks like there’s a metal bar blocking the port halfway in. Is there a way to unlock this?