2004 Chrysler PT Cruiser Shifter problem

The shifter on the cruiser has been sticking badly (hard to shift between gears, feels gummy for lack of a better term). I drove it to work this morning and when I put it in park I heard a snapping noise and the car slipped out of gear. The engine will not turn over and when I try to shift between gears, the shifter moves without seeming to catch on anything. Transmission fluid levels are good, oil was changed 3000 miles ago.
What do I need to do?