STOCKTON — A Stockton pastor claims she and a group of friends were refused service at a restaurant in town because of their race.Valerie Carroll of O'Taste and See Ministries told The Record that on early Tuesday morning a waitress at a Denny’s at 2670 West March Lane denied her group service.The group, which had been out late for a weekly karaoke night, stopped at the restaurant at about 2 a.m., she said.