on my year, the handle is pulled up / out towards you which causes a little metal tab / latch to pull down and away from the lock stop bar inside. I am thinking maybe someone locked it and unknowingly then someone pulled hard on it to start the "fracturing" on the internal mechanism.
I think your only solution at this point, might be to try take apart the lower dash components on that side. I haven't looked close enough but it appears that the hinging is connected to some lower brace structure of the dash.
certainly disable any passenger air bag systems before attacking anything on that side.
hopefully the attached file will provide some hints at getting at the thing successfully.