When it comes to alcohol, it's the producing, selling, and consuming that is prohibited. I don't think touching or coming in contact with it invalidates wudhu. It's not necessarily a najis substance, but rather it's impure for our consumption and handling (selling/producing). Allah knows best. Check here: https://islamqa.info/en/171333
I agree with asking a scholar about specifically being in contact with alcohol, but it's best not to work at a place that sells alcohol because that in itself is haram.