Twist in Pocket / Product Design

Have you ever forget you locked the door or not? Maybe many people have an experience that when you walked on the street or sat in somewhere, suddenly you thought about your door is locked or not?

"Twist in Pocket" is a key handle, it use soft rubber material to remind user lock the door or not. The user can put any key in to the rubber handle and cap firmly. Rubber handle will change its shape when user lock or unlock the door, and their is an sheetmetal inside the rubber to make the shape steady, so user can understand is he lock or not clearly by white strips leaning to right or left.