Rob Wohl, a COVID-19 vaccine outreach worker in Northern Virginia, said his best day on the job was when he walked into a white-tablecloth Chinese restaurant in Falls Church, Virginia, in April to see whether he could sign up employees for vaccinations. He arrived right before the lunch rush, which turned out to be perfect timing. “The manager gets very excited,” Wohl said. “She says, ‘Wait right here.’ She immediately goes and starts grabbing people out of the kitchen — Chinese and Latino workers. Then she calls everyone who was off duty that day and tells them to come in. Suddenly a busboy i...