Intermittently, the key may not start the car or release from the ignition. If it is excessively worn, replace the key. If the new key doesn't work, replacing the lock cylinder including tumblers should correct this concern.
Car Problem Reports
Dodge Caravan Key May Not Start Car or Release From Ignition
Dodge Caravan Problem
Average Mileage: 115,190 mi (50,000 mi - 180,380 mi)
Visitor, 2003 Dodge Caravan, 50,000 mi
key wouldn't fit in ignition - had to have ignition replaced. Still under warranty at the time, but had to pay for tow, etc.