There is a sensor on the inside of the door handle. The drivers side is always active, there is no option to turn it off. Therefore, if your doors don't unlock when you touch the inside of the door handle, then you have an actual malfunction, and you should visit your service dept.

Also, I've found that my cell phone conflicts with my key fob. When I have the two in the same pocket, the car does not detect the presence of the fob, and nothing works (door locks, keyless starter, etc). As soon as I take my cell phone out of my pocket, everything is fine.