2010 Prius. I can only lock the doors via the inside"lock" button. Using the fob button or pushing the door handle lock button on the outside of the car causes a Long Beeep. We tested both key fobs and changed a fob battery. The fobs work properly in all other instances; they start the car and open the doors as expected. I located the on/off switch under the steering wheel. It is in the on position. I have not driven it for a few days and our weather has been rain, freeze, and sun. I considered the sensor on the door handle may be blocked by moisture or ice and thought of pouring in alcohol, but that sensor works fine for opening the door. Any ideas?