I found this bit at Gopher Central

A reader wrote in....."I've been using aluminum foil for more
years. Great stuff, but sometimes it can be a pain. Llike
when you are in the middle of doing something and you try to
pull some foil out and the roll comes out of the box.Then you
have to put the roll back in the box and start over. The darn
roll always comes out at the wrong time. Well, I would like
to share this with you. Yesterday I went to throw out an
empty Reynolds foil box and for some reason I turned it and
looked at the end of the box. And written on the end it said,
"Press here to lock end". Right there on the end of the box
is a tab to lock the roll in place.

How long has this little locking tab been there? I then
looked at a generic brand of aluminum foil and it had one, too.

I then looked at a box of Saran wrap and it had one too!

I'm sharing this with my friends that did not know this. I
hope I'm not the only person that didn't know about this.