The incident occurred at the restaurant in the area of Pacific Coast Highway and E. 2nd Street at about 7:45 p.m. Sunday. The victim was under 10 years old, police said.
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The suspect was described as a Hispanic or white man between 20 to 30 years old with a thin build, dark hair and a mustache. He was last seen wearing a red-hooded sweatshirt, dark pants and a baseball cap.
Anyone with information on this case or the suspect's immediate whereabouts was asked to call Long Beach Police Sex Crimes Detective P. Jennings at (562) 570-7354.