Parking brake lever broken?

So, I was trying to get out of my car this morning, and I noticed it rolled a bit forward towards another persona car. So, I tried turning on the parking brake, I pressed the pedal down (third one closest to driver's door) and I felt it give way. Now it is just floppy and doesn’t want to stay up, the car still moves. But I don't know if it's safe to drive right now. And what exactly is probably going on with it?