Security guards in San Francisco are prepared to strike if negotiations don’t go as planned. On Saturday, the guards represented by the Service Employees International Union local 247 gave negotiators strike leverage as they prepare to return to the bargaining table with three bay area security companies. The workers are seeking better pay and training. According to the SEIU, San Francisco security guards make on average $11.30 per hour while their janitorial counterparts earn on average $11.49 per hour.