“Do Not Open” (*1/2 out of four) was a flat-footed timewaster about a married couple (Shawn Ray and Marisol Ray) that rent a solitary cabin and are warned to not open a locked door at the end of the hall; as their curiosity and intrigue gets the best of them, the eventually open the door and (yawn) all Hell breaks loose. Well-produced on a low budget but doesn’t save the film from being a bore. “Do Not Watch” would be a better title for this trifle.