I checked out of the hotel in the morning and could go back in the morning

No.

If you check out the room in the morning, you will have to re-open the room when you go back in the morning.

According to international practice, the earliest check-in time for a hotel is 6:00 in the morning, and the check-out time is 15:00 the next day. A hotel provides guests with a place to stay and eat. Specifically, it uses its building as a voucher to provide services to guests through the sale of guest rooms, catering, games, entertainment, shopping, business centers, banquets, conferences and other facilities, thereby earning Economic gain for business organizations.