Lost every Yukon key?
No key for a 2007 to 2014 Yukon means cutting a chip key to the code pulled by VIN, then GM's timed relearn on many of these trucks: the new key sits in the ignition with the security light on through several ten-minute stretches, about half an hour altogether. The price is $185, the $125 key plus $60; the wait is GM's, not a charge.
A push-button Yukon with no fob left is $289. We cut the emergency blade to the key code, program a fob to the truck, and drop the lost fob from the Yukon's memory before we leave, at no extra cost. Have the Yukon's registration or title ready, and a driver's license that carries the same name; the truck never leaves its spot.