Use the word men to mean "more than one man." If you use the men's bathroom, you'll probably find more than one man there.
The men on a job, like farmhands or factory laborers, make up a workforce, and they can be male or female and still be called men. You might also use this word to mean "members of a team" or "members of a military platoon." Men comes from man, which in the original Old English was completely gender neutral, meaning "human being" or "person," rather than specifically "male person."