Leave it to Sylvester Stallone to turn the restoration of a 1965 Mustang into a workout montage. By the time he made “Lock Up” in 1989, he’d already done four Rockys and three Rambos, and yet his idea of branching out was to play a short-timer convict who gets beat up a lot. Donald Sutherland plays a sadistic warden (is there any other kind in Hollywood?) trying to keep Sly inside. John Amos, Frank McRae and Tom Sizemore provide strong support, but the story is an unimaginative mashup of Stallone’s previous work with some of “The Longest Yard” thrown in.