My driver side power lock is not working to open the doors on my 02 yukon.

check for power going to the door lock switch,also check for broken wire in between the door and the body ,you will to cut the rubber boot to see the wires

could have a bad switch or bad fuse, if keyless entry is working may not be a fuse though - check wires to switch, if they are ok you may have to replace the switch assy - www.JCWhitney.com for best price 98% of the time