self locking doors

sonic370

as i was going to work today i unlocked my car with my key fob. car was in garage i was in the kitchen. i know the car unlocked because i saw the dome light come on. put my key fob on kitchen counter to get something from out of my room. when i get back and go to get into my car i hear the doors lock.

i had left the fob on the kitchen counter. this all took place in about 3 to 4 minutes. so is there some kind of safety feature built into the car. that if you unlock your car but leave the fob out of range and try to open your doors after 5 minutes or so, and you do not have the fob, the doors auto lock as you approach you car.