A man collapses in the grocery store. His wife starts yelling for help and holding his head. A grocery store worker gently shakes him to determine if he is unconscious, then checks for breathing and a pulse. He doesn’t find either. The worker gets an AED, attaches the pads, and presses the “analyze” button. After being told to deliver a shock, the worker presses the “shock” button. What dangerous mistake did the worker make?