Background; I was a senior NCO in the Nav - My toolset will reflect that.
OK, so if you have someone not cooperating, you need to find your leverage. Physical force is sometimes the only answer that will serve, but you want to limit that to an absolute minimum. The primary motivators of most folks boil down to self-interest, pride, comfort, love, food.
Most cases, an appeal to a persons’ pride does the trick. HOW you make that appeal matters, though. For instance, you can approach it as making them look more mature, or more wise, or more professional. Obviously, knowing the subject and their ‘hooks’ helps. But some hooks are fairly universal: “Sir, you’re making yourself look bad” oe “Sir, this would be the generous and moral thing to do,” and so on. Or, you can reverse that: “Sir, I don’t want to embarass you.” In that latter case, you need to have the apparent ability to follow through on the threat.
You can appeal to their generosity, their dignity, their social status, discipline, or even to shame - most of those point back to pride.
Self-interest is another primary hook - couch how doing what you want them to do is in their own best interests, especially if you can make it look like it was their own idea - that hits two hooks at once - self-interest and pride. Or, if that’s not practical, show them how continuing to resist is in their detriment - fear of loss or consequences. Again, better to be able to look like you can carrry out the threat.
Even the threat of naked coercive force is an appeal to selt-interest.
Comfort (“This will feel better / If you don’t, you’re going to be miserable”) is a harder hook in most cases. Loss of privileges falls under this category - And also may touch on pride.
Love can be used, but it’s chancy - and you really need to know the subject.
Hunger is almost useless - if you’re resorting to that, you very likely will have already resorted to force, first.