William Rivera, 37, is charged with having repeatedly molested several boys in recent days in the Monroe Houses on Soundview Avenue. He was identified to the cops by one alleged victim. Rivera pushed an 11 year old girl into an elevator in her project building at about 9 a.m. Friday. She fought him off and was able to get away. About noon the same day, an 11 year old boy revealed that he had been lured on Thursday into Rivera’s apartment, which is in the same building as the victim.