Low Voltage Technician. Lock City is a fast-growing lock, door, and security company and we are seeking a full-time Low Voltage Technician. The successful candidates will be integral members of our team as we expand. The company is based in Great Neck. Our jobs are in the 5 boroughs and Long Island. Ideal candidates will have a minimum of 3 years of experience in the installation and service of CCTV, Access Control Systems, Intercom Systems, and ...