Here's another theory for you. A while ago I came out from the grocery store and my lid which I thought was locked was open, I couldn't lock it. Our locks are on a pneumatic system and if the hose breaks it wont lock. Perhaps what happened here is that your lid was locked when the line broke, that's why you can't unlock it. They were able to fix mine in about an hour but it is something the dealer had to do as I couldn't get to it. Good luck and let us know what it was.

Pat