One was a gold-colored Yale rimlock. I haven't seen one of these since the mid-1970s. I got it home and I freed the pins with a squirt of WD-40 and everything internally moves OK.
This lock has only 4 pins!

My first picking attempts got me nowhere. Thinking that it was the WD-40, I sprayed the cylinder with solvent. Still no luck, but the pins hang... probably on the spool drivers? I tried raking the pins, that didn't work either. I varied the tension--very light to hard. Nothing! I changed the direction to pick CW and CCW. Still didn't open. After two hours my wife thought I was a little nuts.
Arrrrugh!!

From my ILCO Key Blank manual, it appears the keyway is probably a 997B, or 997EB. Manuevering the pick left, right, and up is difficult, but not the major problem. I made a thin single hook (.023" wide) from stainless steel to help snake around the wards.
I have not taken this lock apart. The cylinder is pinned into the back of the lockset. I disconnected the cam at the back to make sure this didn't keep the lock from turning. However, if I do disassemble, I presume I'll find that all four cylinders have spool drivers.
Anyone have similar experiences with older Yale locks?