Please close the door behind you in order to prevent small traders from entering. How is this sentence euphemistically prompted?

On Taobao, there is a company that specializes in closing the door. You can find it by searching for "closing reminder" on Taobao. Taobao I D is zsjby. They can customize various sounds according to your requirements. In this case, they can customize it to "Ding-dong, please close the door behind you and pay attention to theft prevention, thank you!" , can be set to remind when opening the door, can also be set to remind when opening and closing the door within 4 seconds. I hope it helps you!