How can one go out alone when there is only one room card?

If there is only one room card and a person needs to leave the room, you can take the following steps:

1. Confirm whether the room card has been returned to the front desk or whether it has been pulled out when inserting the room card out. If the key card is still in the room, you can try inserting it back into the door lock and then trying to open the door.

2. If the room card has been returned to the front desk or has been pulled out when inserting the room card, you can try to use a spare key or contact the hotel front desk for help.

3. If the spare key and the front desk cannot solve the problem, you can consider using the room card of another room or waiting for help from others.

It should be noted that before leaving the room, you must ensure that you have returned the room card or key to the front desk or inserted it into the door lock correctly, otherwise unnecessary trouble and expenses may occur.