You can bring a horse to water, but you can't make him drink. You can coerce — or pressure — someone to attend your office holiday party, but you can't make him have fun.
If you're at a point where you feel like you need to coerce someone into doing something, it might be more civilized to just give up. To coerce is to manipulate, use aggressive arguments, pressure unfairly, or threaten — really, this isn't very civilized behavior, is it? Handy synonyms for this verb include force and pressure. In a gangster film, you might hear a character say he "put the squeeze" on someone — another way of saying he coerced them.