If your automobile cannot initiate the engine and the anti-theft indicator is activated, it could suggest the presence of a malfunction within the Immobilizer or anti-theft system. If available, consider using an alternate key fob and verify that the fob battery is sufficiently charged. If these steps prove ineffective, attempt to reset the system by disconnecting the battery briefly before reconnecting it.
If the problem persists, it's best to have a professional mechanic or dealership diagnose and fix it. Learn about a car with a lock symbol.