Unlocking KOKUYO PERSONAL LOCER

"The locker doesn't open because the number seems to have changed."

It opened properly in the morning, but it didn't open in the afternoon.He hasn't changed his PIN, but he says he can't open it with that number.
The site is a clinic in Yokohama, and is a locker for Kokuyo in the break room.
If you turn it with the master key using the keyhole, you can find out the password, but it may be different by one digit, so if you try to shift the last dial by one digit, it will be unlocked.

After that, it is set again according to the conventional password and the process is completed.