Fast-food workers in the St. Petersburg, Fla., area will walk out of the lunch rush on Jan. 8 to protest physical violence and safety threats at work, according to a Fight for $15 statement. The strike is in response to a viral video of a St. Petersburg McDonald’s worker being attacked by a customer.

Fight for $15—a union-backed worker advocacy group—expects employees from the “St. Petersburg, Tampa and Orlando areas” to converge at the St. Petersburg McDonald’s where Yasmine James was assaulted over the counter. Fight for $15 is calling for more explicit security protocols and “a voice on the...