Kill the Day (1996) dir. Lynne Ramsay

A junkie breaks into a locker and steals a bag, to get money for drugs. Later we see him in prison. He seems like a loner. Guards taunt him and try to make him lose his temper, so that he will be denied parole. When he’s released, he tries to go straight. Interspersed with these scenes are flashbacks of his younger life.