J.L.
Maybe you could try making it a game. My son (now 6) resists tasks but the second I make it a game he buys in. I say lets see who can pick up the most toys and then we do it together, and I let him win. Or I'll say, lets see how many seconds it takes to put you toys in the basket. Then I count. I do the race game to get him dressed too. He tries to beat his record each time. I'll stop counting if he has an issue, like his head gets stuck in his shirt.
We also have a smiley chart for good cooperation, good listening etc. He gets a small reward when he fills the chart, like ice cream out or a little toy from the toy store.
This works for us. I also use 1-2-3 magic, that works too.
Hope this helps!