This is exactly the reason why many of us do not work any harder than we should. Just because I go up and above 100% for the day, doesn't mean I will get more in pay. I will do what my job entails, and end there. You are in a production environment, and you treat it as such. No more, no less, and you're good.Thats the problem with the way low skill work is now days, you have no real incentive to work any harder then others on your team. Doing the bare minimum to skate buy gets you just as far and makes you just as much as the person who busts their ass and does an amazing job. Bring back opportunities for advancement or offer financial compensation for great performance and you will see a change, but I realize that kind of management philosophy is quite dead.
Why on Earth would you want to work at 125% - make the same pay - and add to the CEO's $24,000,000 annual salary? You are the lowest on the totem pole, doing arguably the most important work, but who get the bonus when you come in at a more productive number? Not you.
Also, we have rates for cartons/hour that we have to meet. If you continuously try to "bust your ass" to hit 120% of what is expected, pretty soon that 120% will be the new 100% as they raise the expectations.
It's great that you want to be a stellar employee, but you are going to get nowhere fast in this company by breaking your back.