Do you want to~ = Please ???

Hi there,

I want to have some opinions about an expression, "Do you want to ~?" in terms of "Please". How often do you use this expression when you want to ask someone to do something? I'm pretty confused with this, because usually I say or hear "Would you ~" for requests.

E.g. In the situation like you have so much in your hands and want to ask someone to open doors for you. Do you say, "Do you want to open the doors?" meaning, "Please open the doors."?

Or like, you have a coffee cup in your hand, but you want to re-tie your shoe laces. Do you say to your friend, "Do you want to hold this for a sec?"?

If you do, is it universal or more like regional?

Thanks bunch for your help!!

soylista