Legal work? Lol?
If we decide to f them up, we can just do it.
And I wouldn't invade on the ground, not a chance.
1)US Navy sweeps the Iranian " Navy" ( lol) from the sea in the first 24 hours
2)misslle strikes and bombing against every single airbase of the Iranian Air Force
3)bomb power plants, dams, food processing plants, railyards, etc to bring their economy to a crashing halt
4) impose a 100% air and sea blockade
5) /popcorn and watch the place go full Mad Max as the mullahs are unable to control a starving populace that has no power for their modern technology
6) inform their government that any retaliation against targets in Israel/Europe/US will result in area bombing of every major city in Iran