Urgent - TN Visa - without appointment

Hi, I am located in Canada…have a US job offer, the work must start tomorrow. I want to get TN visa tonight or tomorrow at Piece Bridge/ Rainbow Bridge. when I called US CBP officer this noon, he told me that I should book appointment and the earliest availability is after 1 week i.e on May 27. The work can’t wait till then… pls suggest any other alternatives to get TN visa soon. Appreciate your quick reply