Two gunmen robbed volunteers cleaning up after an evening bingo social at the El Sobrante Boys & Girls Club on Monday night, taking at least $800 in cash after forcing two victims into a closet.Nobody was hurt, said Contra Costa sheriff's spokesman Jimmy Lee. The victims reported the incident at 10:23 p.m., minutes after the robbers left, but deputies found no suspicious people or cars in the area.The robbers were white men, one 5-foot-8 to 5-foot-10 and weighing about 170 pounds, the other six feet tall to 6-foot-2 and weighing about 160 pounds. The shorter robber wore a black jacket, dark pants, a black ski mask and carried a black handgun. The taller robber wore a dark blue jacket with yellow lettering on it and dark-colored gloves.Authorities ask anyone with information to call the sheriff's dispatch at 925-646-2441.