key code is on ignition cylinder and drivers door lock..  to remove the
ignition cylinder you need to drill a small hole in the potmetal housing that
attaches the ignition to the steering column...  then depress a tab and the
ignition comes out.  its hard to describe this location but i could get a pic..

*all you need is a cordless drill and a spare ignition with a key.   just
remove the plastic column cover, drill small hole, and press tab in hole w/.
screwdriver and the ignition slides right out. the whole process takes no more
than 5 minutes.
Now if your missing keys alltogether, the best way to get into your van is to
use a small screwdriver, and pry out the plastic slider window guide tabs
(usually only one does the trick) at the bottom of the slider..  then with your
palms open, press up on the window, it will jump over the lock detents in the
track, and you can slide the window open and reach around and unlock the front
doors.   then just tap your slider window guides back in place.. no damage
done..*

* disclaimer:  not responsible for any losses incurred as a result of above
information  :<)