Cashback (2006) on Netflix

When art student Ben Willis is dumped by his girlfriend Suzy, he develops chronic insomnia after finding out how quickly she moved on. To pass the long hours of the night, he starts working the late night shift at the local supermarket. There he meets a colorful cast of characters, all of whom have their own 'art' in dealing with the boredom of an eight-hour-shift. Ben's art is that he imagines himself stopping time. This way, he can appreciate the artistic beauty of the frozen world and the people inside it - especially Sharon, the pretty and quiet checkout girl, who perhaps holds the answer to solving the problem of Ben's insomnia.