Door ajar light

My door froze this mornignand I had to take action (read: kick) the door to open it. My door would not latch closed. I hae got it to close now, but my door ajar light remains on. Any idea if this is a fuse or just a light in the panel.

90 Rolla sedan

Thanks in advance and by the way what a cold 50 mile trip home in the 20 degree weather.

Problem solved. When the car thawed in the garge, one of the back doors popped open and was causing the light to be on.

Proves that you check the simple things first.