This is a simple one liner that someone told me at a group meetup. I think it's deceptively simple - we'll see how long it lasts :)
In the US, I open doors, but in the UK, I am used for profit. What am I?
No matter where you are, it performs the same function.
This is a common object - the riddle does not describe its function, but rather, its name
You almost certainly own one of these
Super mega spoiler hint:
It's right under you nose