SAN FRANCISCO, Nov 16 (Reuters) - U.S. President Joe Biden on Thursday said he would keep working to advance a Pacific trade pact, even as his vision for a regional deal to counter China's influence stumbled over his bid to strengthen workers' rights. "Our work is not yet done," Biden told corporate CEOs in San Francisco where he attended a summit of the 21-member Asia Pacific Economic Cooperation (APEC) forum. "We will continue working to better facilitate high-standard trade that advances workers' rights through strong enforcement of labor standards." Biden was also to take part on Thursday in an event...