Door Ajar Light

I have an '06 Focus ZX4 SE. This morning on my way to work, I noticed my door ajar light was on. I pulled to the side of the road to go and open/close all my doors and found they weren't open at all and my light was still on with all doors firmly closed. Does anyone have any ideas as to what is going on?? Any help will be greatly appreciated. Thanks in advance.

One or more of the door latch switches has failed possibly due to a dirty contact. Take it in and have it fixed under warranty.