I have my latches out of the doors and investigated a bit. I think you can get the door open with a thin tool inserted from the inside below the latch and push the safety catch upward. That should release the latch barrel and allow it to rotate when you push the door open. This should work even without the handle turned. If that doesn't work, maybe a #12 boot on the inside will.
Good luck
Here are a couple pics with annotations (you may have to zoom up a bit to read them.)
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
