1. communicate with the owner: communicate with the complaining owner to find out the specific situation of the lobby door not being closed, including the specific performance of time, frequency and safety issues. Through communication with the owner, we can better understand the nature of the problem.

2. Investigation reason: The property management company should send staff to the site to investigate and find out the reason why the lobby door was not closed. Including equipment failure, human factors or other reasons, the root cause of the problem can be determined through investigation.

3. Formulate solutions: According to the survey results, formulate corresponding solutions. Equipment failure needs to be repaired or replaced as soon as possible; Human factors need to criticize and educate relevant personnel or take other measures. The solution should aim at the specific situation, ensure that the lobby door is closed normally and solve the safety problem.