No. In fact, technically a worker can agree to accept any condition as in monetary matters a condition always applies – even against a Torah law. Secular law does not allow it and it may have a halachic status.
However, according to most economists it causes unemployment by pricing labor above the value of its production. It is also inflationary as there is more money. Both are functions of the Law of Supply and Demand. Thus it is counter-productive.
As for the restaurant owner in Seattle, maybe he would have another six without the raise. Or maybe he cut labor costs. You, laskern, have committed the logical fallacy of post hoc ergo propter hoc (after this therefore because of this). Your statement is akin to someone saying “Hocus Pocus”, rain falling ,and then saying that the rain was caused by his statement.