Khulwat e sahiha with doors closed but not locked.

If a nikaah has happened but consummation didn't take place and that couple sit in a dining room which is usually accessible by everyone. The event goes out like this: 1) couple are in the room with the slightly opened door. People are in the house and that couple are not assured privacy. Brother of the husband enters the room without permission and the husband asks him to go out. Then either the husband closed the door without locking it or he left the door opened slightly. 2) brother after a few minutes again enters the room without permission. Husband then asks him to go out and closes the door without locking it. People were still outside. 3) after a few minutes mother of the husband knocks the door and the husband opens it and says the door is not locked. Mother then leaves the room while keeping the door open and says keep the door open we won't disturb you guys. But people were still outside and there was always a fear of someone entering. Please let me know if this is khalwat e sahiha or no. Note that generally people would enter this room without permission and there were always people in the house so risk of someone entering was always there. Also let me know it is khalwat e sahiha and divorce happens after khalwat e sahiha but before consummation. Will it be talaaq e bain or rajee? Note that this whole event would have been of 15 mins