I WENT TO PICK MY 3 YO TWINS AT SCHOOL. OPENED MY DOOR, GOT OFF THE CAR AND CLOSED IT, WITH KEYS INSIDE MY PURSE AT FRONT PASSENGER SEAT (MY USUAL ROUTINE). WAS ABLE TO OPEN PASSENGER'S BACK DOOR, BUCKLED MY SON TO CAR SEAT AND CLOSED HIS DOOR. WHEN TURNED TO OTHER SIDE TO OPEN THE DOOR FOR MY GIRL, NOTED CAR WAS LOCKED AND IGNITION TURNED OFF WITH MY 3YO SON INSIDE. ALL DOORS WERE LOCKED DESPITE KEYS BEING INSIDE CAR AND IGNITION OFF. REMOTE CONTROL WAS OPERABLE WITH BATTERIES FUNCTIONING WELL. SCHOOL DIRECTOR CALLED 911 AND FIRE DEPARTMENT WENT TO ASSIST. THEY WERE UNABLE TO OPEN DOOR AND AFTER ~20MINUTES OF MY SON BEING INSIDE, BUCKLED AND IN FLORIDA HEAT, EMT AND FIRE FIGHTERS HAD TO BREAK A WINDOW TO GET HIM OUT. WHEN I WAS ABLE TO GET HIM, HE WAS EXTREMELY HOT WITH ELEVATED TEMPERATURE AND SOAKED IN SWEAT. THANKFULLY I WAS NOT WITH MY 3MONTH OLD BABY THAT DAY. SINCE MY BOY'S TEMPERATURE WAS COMING DOWN NICELY WITH SUPPORTIVE MEASURES I DID NOT TAKE HIM TO THE HOSPITAL AND DECIDED TO OBSERVE AT HOME. CAR HAD SERVICE 6 DAYS PRIOR TO THIS EVENT IN AUDI FORT MYERS NEXT DAY ON 10/08/10, TOOK CAR TO AUDI FORT MYERS AND REPORTED EVENT TO SERVICE DEPARTMENT, COMPUTER SYSTEM WAS CHECKED AND NO EVENT WAS REGISTERED. THEN I WAS TOLD BY EMPLOYEES AT AUDI, THEY COULD NOT EXPLAIN THE EVENT BUT NOTHING THEY CAN DO AND NO NEED TO REPORT TO AUDI USA.