Even though the companies are required to pay you out your last check and unused PTO, many HR departments will hold the envelope with the check in front of them

Even though the companies are required to pay you out your last check and unused PTO, many HR departments will hold the envelope with the check in front of them and give you the paper to sign. They will not use words, because that will be illegal, but they will let you think that if you don't sign you don't get the money. It's up to you to know that you don't need to sign to get your money.