I find milk cartons the worst to open as no matter how I try I can’t get the click, I’ve even asked the post man to open one for me 😳 I was totally stuck one day and rummaged in the drawer trying to find something to grip the cap and found some nut crackers which have been there since heaven knows when, and believe it or not they are wonderful, they open all types of tops including bleach because I can exert as much pressure as needed and my hands are really bad. I’ve even searched in charity shops for some more to pass on to friends so simple but so useful.