The 23-year-old worked at the fast food restaurant at 1531 Fulton St. in Bed-Stuy when he got into an argument with a female customer inside the restaurant around 7 p.m., according to law enforcement sources. The fight broke out outside, and the woman’s adult son pulled out a gun and shot the worker in the face, police said. The victim was rushed to Brookdale Hospital in critical condition. On the spot, the police arrested a 20-year-old man. No charges have been filed. The victim is not the first fast food employee to be shot on the job in the city this year. In January, 19-year-old Kristal Bayron-Nieves was fatally shot by an armed robber while working the register at a Burger King in East Harlem. The teenager had just started working at the restaurant and handed over $100 in cash to the robber before he shot her in the torso.