Try something for yourself. Go up to a person and have them stretch out their arm in front of them. Then firmly push with your hand against the hand of their extended arm.
My guess is that the harder you push, the harder they will push back. it is simply human nature to do that. So to get someone to be interested against their will is impossible.
If you want them to become interested then you have to figure out what makes them tick. When you have something that gives them a "benefit" and improves their situation, they will become interested.
Everyone listens the the radio station "W.I.I. F.M." (What's in it for me)
So in answer to your question, find out what they desire and figure out a way for what you are "selling" and make it apply to them. If they benefit, they are interested. Period!