I'm not in favor of physical punishment, but I don't think "as small as" is a good way to think about it. You're teaching them a general pattern (varies by parent, but perhaps "when I require you to do something you have to do it").
If they learn that if they refuse strongly you will just drop it, you'll get a lot of that.
This is how it works for adults too: if you are involved with the legal system on a minor matter, and then start disregarding the courts requirements ("contempt of court") they will escalate this quite far, up to jail time.
This is also worth thinking through before you make a demand of your kid: is this really something that you are willing to enforce? Is it that important? Can you start with something weaker than a demand and talk about it first? ("Your room is really messy and I'm having trouble getting to the dresser to put your clothes away.")