All of them I've seen are short like this. Probably served to keep the kid who was using it to open the cans safe, too.
We always used a church key*. I never saw one of those until I was an adult.
*I've become increasingly conscious in recent years that things I thought were normal and everyone knew aren't anymore. Must be a sign of the passage of time...or something. Anyway, church keys look like this and were essential devices before pop-top soda/beer cans:

They were giveaway advertising items; every danged store and many other businesses offered them free.