electrical system appears dead

What is your question?

Drove to work this morning fine. Truck parked all day. At 6 tonight truck will not respond at all - engine electrical system appears dead. Lights work. Horn works. Electric locks work. Flashers work. Radio does not work. Dealer supplied a "spare" key - no luck. Tried jumper cables - no luck. First time I've ever had this problem.

What makes this problem better or worse?

No response to anything I tried.

How long has your 2017 Ram 3500 had this problem?

First time ever.