Ah, yeah I know that feel. When my golden was a puppy he used to jump on people and whenever I'd ask them to push him away or turn away they'd say "oh I don't mind!!"
Like...that's. not. the. point.
It seems fine when he's a puppy, but as he gets older that "harmless" behaviour can accidentally knock someone over or hurt them.
Do you have some friends or family members who wouldn't mind helping you out? Assuming he jumps at people when they enter the house of course. get them to come over, and get him to sit calmly when he goes to greet them at the door. Hopefully that behaviour translates to outdoor situations with strangers