Return key on an Apple wireless keyboard has stopped working after several yrs.

So follow up.....I ended up rolling my finger around on the return key, pushing it in all directions, the whole key at the same time with 2 fingers, and it worked! And has worked a few times since then so fingers crossed it has corrected, for the time being at least. Perhaps a bad connector sensor or a small piece of debris under the key (if that's possible on these keyboards?)? Thank you for your time.

I was able to confirm I was in Safe mode. Glitchy screens, webpages wouldn't load most of the content, part of the content would flash on and off. Was using Chrome. I tried to use the return key to post on social media, no go. I then opened Pages, new document and tried to return after typing some letters. No go. Perhaps the key itself is shot. I guess I will take the keyboard into my local repair/retailer and they should be able to see if it works on one of theres. The new chip in the Mac 27" can't come out soon enough so we can replace this old beast....

Didn't know there even was a 32" iMac, only the 24/27". This 27" has truly been a dud from the start. No one could ever fix it and unfortunately it should have been replaced but I couldn't get them to. As soon as there is an M1 chip in the 27" I'm getting it. Any rumours on time frame? Is the Pro Max a new machine coming out? Thanks for your help.

Thank you for your reply. I too thought perhaps it is the keyboard that is simply old with a worn out key. I did go to the keyboard viewer and the return key was not marked on the keyboard in the box. The letters were. When I hit the return key the corresponding key (not labelled return), did not light up. I then tried hitting a letter and that also did not light up. Does that mean anything? Again, all letters work, I'm typing this with the keyboard. I will next try safe mode. Not sure if I am supposed to hold the shift key for the entire up to 10 minutes while it reboots? Will google and see what it says.