AAA Roadside Assistance is available if you have a membership. A basic membership is $57/yr. If you are a member, you are allowed 4 roadside assistance calls per year at no charge. This would include lock out service, battery jumps, towing, flat tire changes, extrication and winching, and fuel delivery. There are certain limits to the various services, but a lockout would be at no additional charge.
To contact roadside assistance, call 1-800-AAA-HELP (1-800-222-4357). If you purchase a new membership, there is a 24-hour waiting period before you can use your first call. If you are not a AAA member, you would have to call a different roadside assistance or locksmith company, which may run $20 to $75.