And then they unlock automatically when you walk back to them. Much more convenient than having to manually fumble for the lock and unlock buttons. Not sure what the problem is here!
Park at a convenience store. Go in to get a coffee. Leave friends in car. Friend decides they want a coffee too. They open the door-- car alarm goes off. I'm sure some cars are better programmed but this has happened to me in several cars. (For the record, I still prefer keyless!)