“Deadbolt” (*1/2 out of four) was a banal procession of half-hearted horror-movie cliches about a young woman (Rebecca Liddiard) seeking a fresh start who moves into a new house when (yawn) she notices strange occurrences keep happening that affect her sleep and eventually her sanity. More fun and more scares may have ensued if she had asked her doctor for a prescription for ambien instead; she certainly could have watched the movie for help with sleep. Liddiard’s sincere performance is one of film’s only virtues.