That's definitely NOT a factory option, so you're either hearing the steering column lock (like others alluded), or you have an aftermarket accessory. You can only lock the car from the outside with the remote, or the door handle (if equipped). You can also lock it from the door panel lock switch... but with the door fully open, with the fob sufficiently away from the inside, so it door locks don't reopen.unless I'm dreaming, mine locks anytime i have the key in pocket and walk away more than15-25 ft.