No matter what sort of work you do, at some point you end up needing a sharp edge. I usually have a small folding knife with me for just such occasions. Sometimes, other people need the sharp edge so I lend them my knife. Now, they can open it fore sure, but almost everyone is confused on how to close the knife.
I even had one co-worker who ended up disassembling my knife trying to figure out how to close the darn thing!
It's just a skill people seem to not have and they should as it's a very popular design.
I have included a link to a video which illustrates how to close a knife. The video is not mine.
This video appears to be missing an important step - keeping pressure on the flipper part of the blade so it doesn’t accidentally come down on your thumb as you disengage the lock. It helps if there is a more significant flipper guard on the knife, which the sample in the video appears to lack.
I think you’re right, I didn’t notice it initially. Maybe I can find or make a better video.