Santonastasso Enterprises, which operates McDonald’s locations in the Pittsburgh area, allowed 14- and 15-year-olds to work more than three hours after 7 pm on school days, after 9 pm over the summer and above the permissible number of hours during the school week and on non-school days, according to the Labor Department.In one location, a worker under the age of 16 was allowed to operate a deep fryer that didn’t have a device used to automatically lift and lower baskets.Overall, 101 minors at 13 locations run by the franchisee were working in violation of child labor laws, the Labor Department said Monday.“We take our role as a local employer very seriously and we regret any scheduling issues that may have occurred at our restaurants,” John and Kathleen Santonastasso, owners of Santonastasso Enterprises, said in a statement provided by McDonald’s.“Permitting young workers to work excessive hours can jeopardize their safety, well-being and education,” said John Dumont, wage and hour district director in Pittsburgh, in a statement on the investigation."