I bought a 63 without a key and the doors were locked too. I put the key from my 64 in and worked and wiggled and it unlocked the door. The ignition was sloppy enough that it worked just like it belonged. I can start my 64 with a screwdriver or any other key that will fit into the slot. Anti-theft precautions wasn't high priority back then I guess,
Scott

Scott Ward

2 1948 1.5-ton Loadmasters
The red one and The snow pusher
1 1950 3100
1 1955.1 Chevy 6500
1 1954 Chevy 6500 2-Ton
1 1955 1st Series COE 5700
1 1963 K20 (454)
1 1964 C10 (350)
1 1951 1.5-ton Dump Truck
1953 and a 1956 Ford F800

Raising a teenager is like trying to nail Jello to a tree!