A young man entered a Queens bank with a gun Tuesday, ordered customers to the floor then escaped with $50,000 he stole from a vault, police sources said.

The robbery took place shortly after 9 a.m. at Queens County Savings Bank at 61-49 188th Street.

The suspect, believed to be in his early 20s and wearing a baseball cap and sunglasses, entered through the rear. He waved his silver gun at two customers, forcing them to lie down. Then he ordered one employee to let him into the teller station, and another to open a vault stacked with cash for the ATM, sources said.

He ran out the front door and hopped into into the passenger’s seat of a silver Toyota Corolla, which sped off.