ignition cylinder

My 2000 Caravan's "hey buddy you left your key in the ignition" warning chime doesn't sound when I merely open the door with the key in the slot; I have to wiggle the key. The lock cylinder itself turns smoothly and the other functions seem OK. Would this be the lock cylinder, the switch - or...

Hello all! I am new to the forums but excited to learn from all of you. I bought a 73 Valiant last month that is running generally very nicely, but a few nights ago, the engine refused to turn off when I turned the key back into the off position-- you can move the key all around, take it out...