Don't work hard, work smart
ask question. Every day. Every hour
> how does this work?
> How does this part relate to this part?
> What is his/hers function in the process
> Why do we do it like this?
> How can I avoid a problem
Everytime something goes wrong, get the veterans to explain the how and why.
Asking questions, and of course remembering the answers, means that people will see you as a seeker of knowledge, someone who is "interested".
The more knowledge you have, the more valuable you are.
Still, here in the beginning, you need to show some initiative. Downtime? Pick up a broom and sweep the floors. Pick up some litter. Unclutter some mess. Go through the lines and look for cracks, loose material, anything which seems out of the ordinary. Make it seem like you give a damn.
When the veterans start their tirades against "the system", "the owners", "the management", keep fucking silent and don't be part of it. You have no experience, you don't know what the fuck they are talking about. Absorb what they say, and maybe, there will be 10-20% sensible things that you can take with you in your further career to improve things. Stuff that has been downsized and saved money on that costs too much because it results in bad production or production stops, etc etc etc.
Keep your eyes and ears alert.
DO NOT USE YOU PHONE, seriously!
Always be ready to jump up when there is a task to be done, don't sigh, don't moan.
One last thing: you are the greenhorn, you WILL be subjected to the worst kinds of work and the most annoying tasks, because that is all you are good for, and it is also to test you and to see how you fare in harder conditions and under pressure.