The suspect reportedly used the knife to threaten a worker at a store in Rego Park.
He then tried to force open the register, but wasn't successful.
He grabbed a bottle of liquor before taking off.
The incident happened June 29 around 2 p.m. on 63rd Drive.
The suspect is described as a white male, 29 to 32 years old. He is approximately 200 pounds with a shaved head and goatee. He was last seen wearing a black T-shirt with white writing, tan shorts, white socks and sneakers.
Anyone with information is asked to call Crime Stoppers at 1-800-577-TIPS.