The restaurant's manager was locking up just after midnight when the robber walked up, pulled out his gun, and demanded cash, police said.
The robber stole the restaurant's money bag and took off. It's unknown exactly how much money was taken. The victim called 911, but the gunman was gone when police arrived.
Police couldn't give a complete description because the gunman was wearing a mask, but he's described as a black man about 6"1' between 30 and 40 years old weighing 150 pounds.
No one was hurt during the robbery.