If you are the owner or waiter of a restaurant or coffee shop, you can consider the following ways to gently urge the guests to leave:

1. Reminder time: You can remind the guests that it is 12 o'clock in the evening, and hope they can understand and leave as soon as possible. For example, "Hello, it's already 12 o'clock in the evening, and we need to close the store in a short time, so I hope you can leave as soon as possible."

2. Guide away: You can guide guests away from the store, such as helping them check out and leading them to the door. If the guests haven't left yet, you can remind them of the time again and help them leave.

3. Express gratitude: Don't forget to express gratitude to the guests while urging them to leave. For example, "Thank you for coming. We really appreciate your support and trust. I hope you can understand that we need to close the store at this time."

In short, when urging guests to leave, we should pay attention to words and tone to avoid unnecessary conflicts and dissatisfaction. At the same time, you should also express your gratitude to the guests so that they can feel your concern and respect.