Okay this worked for me and for so many other people. But all you need is a cotton ball/pad and rubbing alcohol. I know it sounds crazy but trust me I just got done doing it and I just had to share it with people. Here are the steps:
1. Get a cotton pad and rubbing alcohol that is at least 70% isopropyl or higher. (Note: the rubbing alcohol cannot have too much water in it or it will ruin your device, so make sure it is 70% or higher).
2. Put a little bit of the rubbing alcohol on the cotton pad. [do not soak the cotton]
3. Make sure the lock switch is locked (idk if this is important, but that's what I did)
4. Hold down the play/pause button and gently dab and squeeze a little of the rubbing alcohol in the cracks of the play/pause button section.
5. Rotate your fingers along the scroll wheel to move the alcohol around.
6. Try the button! (Note: if it does not work, try again. I had to try a few times because I don't think the crack in between the buttons was big enough to let the rubbing alcohol through)
There is also a video of it on YouTube called "How to fix a broken IPod click wheel quick and easy" by a channel called Do It Yourself
Good Luck!! :)