Two armed men attacked an employee at the Sunoco gas station on the 1800 block of North Grand River at 11:20 p.m. Sunday.
The man had just closed up when he was beat by the two men, who both had guns.
They took his keys and his backpack, and ran away.
The 29-year-old victim was treated for a non-life threatening injury at the hospital.
The suspects have not been located.
Police are now checking for surveillance pictures of the incident.