MIWA U9.NDR, Unlocking the entrance door by not carrying the key

"Unlocking the entrance door by non-carrying a key"

I heard that my housemate left the door unlocked and went on a trip. The client had gone out the day before without his keys, and when he returned, he was gone. My housemate is already on the train and can't come back. It was said that they were not able to coordinate well.

The locking point is the upper auxiliary lock MIWA U9.NDR (NDZ). Since it is not a CP product, I don't think it comes with a security thumbturn, but after checking the thumbturn, I usually raised the thumbturn to unlock it.