Come up with a list, begin calling people and always have in mind that without intense research, you won't manage to find a trusted contractor. Prior to giving your money away, you need to know that you're dealing with a professional and not an amateur who might destroy your lock rather than repair it. Be reasonable and give everyone a chance. Not all people have the patience to hire a good San Antonio TX locksmith, and most people are in a hurry to just hire someone. Try to be different, and make yourself time to choose the best contractor. Additionally you have to find out about a contractor's level of experience. Determine where they learned the job, and why they chose to be locksmiths. It's also wise to inquire them for how long they've been working as a locksmith because you want to have an idea of their experience.