Technologically crippled as I am,all that newfangled Electro/Laser/Low Frequency types of communication between the Key and the Automobile is
VooDoo to me.
However,Most of the East Coast Techs (Arthur Dalton,Stevebfl,...)keep early hours.One of the Electronic Wizards will be along shortly after first light I'll bet.

Are you saying (As your "Header" states) that the key ,when inserted in the
Ignition Switch Tumbler will not turn to the "Run" or "Start" positions?
In the older models (70s,80s,90s) Ignition key that will not turn is First Warning
(And maybe the Last)that the Ignition Tumbler is "Going South"on you.
[Ignition Keys are Steel...The wear takes place in the Tumbler.]

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'84 300SD sold
124.128