There's aftermarket keyless entry systems, but I've never had a problem walking up to my own vehicle and using the key to unlock it. In fact, I kinda enjoy the fact that my Patriot is as basic as yours, and almost never use the remote to my Impala for anything. And when I do use it, not long after it gets in my pocket something hits a button just because of me moving a certain way. Shift my weight and suddenly my car goes nuts because something in my pocket hit the panic button. I've got half a mind to destroy the little bugger, believe it or not.