What year? Our '08 Escape auto locks when you get up to 12mph. I would rather when it goes in gear or touch the brake. Cant change it. I think to enable or disable. You have to do it in the messenger center between the tach and speedo. It will be in the owners manual.
If it is an XLS and not XLT, the '03 may not have that feature. If he has the keyless on the door. It maybe programed through there. Some of the early ford auto locks did it that way.
edit; Our '01 escape xlt did not auto lock. Feature wasnot available