Thirty-five years ago in LAS with high heat a passenger tried to open an over wing. The cockpit light came on, went back, handle was stowed. Back to cockpit, no light. Took off, light came back on. Returned to Vegas with hot wheels. Mechanics were honked. "Why did you return? it's a plug door." I said, "I'm not worried about the exit, but rather the slide external door pin may be pulled." "I don't want that @#$# slide wrapped around the tail." An hour later it was cool enough to reset the door. Nice to see they finally figured it out.