NELLIE PEYTON SET in the shady underworld of Lagos brothels, Nigerian thriller Òlòtūré gives viewers an inside look at the sex trafficking schemes that ensnare thousands of Nigerian women each year. The film is fictional but aims for a realistic and gritty picture to raise awareness of what is a persistent and little-discussed problem, said 36-year-old director Kenneth Gyang. For decades, scores of Nigerian women and girls have been lured to Europe with promises of work, then trapped in debt bondage and forced to sell sex. The United Nations migration agency estimates that 80% of Nigerian women arriving in Italy…