Thats the way my Prius worked. They use the SKS key from the Lexus in the Prius. You have the key fob in your pocket, walk up grab the handle and it unlocks , the two front door handles have sensors in them. The Lexus hybrid I drove has sensors in all the handles and it uses a credit card looking piece that you put in your wallet.
Put your foot on the brake press the start button and away you got in about 9 seconds.
It takes me that long just to make sure my skirt isn't outside my door when I close it.

I think the Corvettes had this feature years ago.