For children just leaving elementary school, they should know how to use a combination lock. I remember I had quite a lot of trouble with my lock. Hopefully, this will help her/him.
Pick up a combination lock.
Turn your combination lock three or more times to the right. Stop on the first number in the combination. It is okay if you slow down.
Turn the lock to the left, passing the second number only once. Once you get around to it the second time, stop turning.
Turn to the lock to the right stopping on the last number. DO NOT PASS THE THIRD NUMBER ANY NUMBER OF TIMES!