Living room lock (Lever Tumbler) unlocked

"The door of the indoor living room can no longer be opened"

The site is a residential area in Setagaya, where many old buildings are located.The guided room is a quaint indoor living room.The door there was a lever tumbler lock.It's a passageway door where you don't know if you need a key.

I've never locked it, so I don't think a deadbolt was used.It seems to be simply a defect of the latch operation.Attacking the gap is too narrow for a 2mm tool to enter.

During this work, when I suddenly saw the grip ball, it was fixed with a set slew.I don't have this screw.
Therefore, since the grip ball could be easily removed, all that was left was to operate the spindle shaft.It is completed by newly fixing with a set screw.