Who's Minding the Store? (1963)

Barbara (Jill St. John) is a very rich girl who falls in love with Norman Phiffier (Jerry Lewis), a poor young man. She doesn't tell him who she really is and prepares to marry him. But, Mrs. Tuttle (Barbara's mother) doesn't want her daughter to mary such a poor man. So, she hires Norman at one of her big stores, and gives him the most difficult and disgusting works. She hopes that seeing Norman humiliated, Barbara will finally leave him. But things don't work exactly this way...