Tonight was a very hard night!

So, I guess I am needing a little advice on some Parenting. I am not a good punisher, and never have been. First of all, in all actual reality, I honestly never had to even worry about punishing my daughter Shanlee. She has been an Angel child through out the years, and being 15 years old, she still is. NO JOKE! It's the truth. And I probly now just JINXED MYSELF! LOL!......Now our little Landon is a different story! LOL! Granted, he's only 5, and I know 5 year olds can be stinkers, but Monday night, he was more than a STINKER! I have no idea what got into him, I keep telling myself that he was just overly tired. Had a bad day, not sure. But after I picked him up from John's Mom's it all started! He was sass mouthing me in the car. Yelling at me. Giving me crusty looks! He would not listen to me! I finally turned up the radio for our ride home. I was then thinking to myself once we got home, things would get better. THEY DID NOT! THEY GOT ONLY WORSE! He kept sassing me, yelling at me, kept telling me "NO!" I finally made him go up to his room and sit on his bed! From there it continued! He would come screeching out of his room and stand at the top of the stair case and yell down to me! It was awful! I finally got out the bar of green soap and started to threaten him with it. Well, the threat soon became reality! AND I FEEL SO BAD STILL TO THIS MOMENT ABOUT IT! But I put some soap in his mouth and thought that would for sure make him stop his yelling and telling me off...it did not! He kept it up, by this time I am in tears. Not understanding what I did so wrong for him to treat me this way......the night just continues with yelling, sass mouthing......He was up in his room almost the whole evening! My Husband always tells me to give him a good kick upside his bum, but I am not good at spanking! Never have been! Never will be! ANY IDEAS ON SOME PUNISHING THAT WORKS FOR LITTLE MOUTHY 5 YEAR OLDS? AND THAT WON'T BREAK A MOTHER'S HEART INTO TWO?? HELP! P.S. By the end of the night he told me he was sorry and he kept saying "It will be ok Mommy, it will be ok!" LOL! Little stinker! He's been pretty good since, but I still need advise for next time. I hope there will not be a next time, but just in case! HA!