Blue shield club heater maintenance. Joe(JC)R. 02/13/2025 Performed full system evaluation and safety inspection. I arrived to perform the customer’s annual heater maintenance. The customer didn’t want any questions and said that everything was running well. The customer wasn’t interested in having the dryer vent cleaned or the hot water tank flushed. I asked the customer if I could open the garage door. They said I could and I opened the door. I opened the single door by mistake and it was locked. I was unaware that it was lock. It bent a piece of metal at the top allowing the middle metal section to come loose. I was able to get the middle section back into place and partly unbend the top metal piece. I the inspected the furnace. The heat exchanger was in good shape and the heater components were in good shape. The system is operating correctly at this time. I also replaced the filter.