1996 Chevy Corsica locks rapidly

I have a corsica 3.1 L 1996 model.
when I start the car, I put the gear on drive postion, and the door get lock automaticly, which is normally for that car.
but the problem is that the door locks keep on locking rapidly over and over while i'm driving, and the dome light doesn't turn off as well.
do you think that there is any solotion for my problom?
please help me it driving me crazyyy
i have to mention that when I turn the car off, the dome light still stays on, and get off only after long time.