undefined undefined is a leader in the current marketplace of Locksmithing and Security. Founded by four brothers with over 35 years of experience, SLK, specializes in all types of residential, commercial, automotive locksmith and security services. You will find us across the United States with major offices in New York, Connecticut, Texas, Rhode Island, Illinois, and Arizona. Our prime goal is to keep our Clients. We do so by making sure our customers are safe and comfortable day by day, year after year. So, we’re happy to offer you 24-hour locksmith services in Chicago, IL, because we know the need for a locksmith can occur at any time.