Security light on, not starting

If you have another key then use that key to see if it does the same thing. If it does you would need to check for codes. Here is a link on how you can do it yourself if you have a scanner:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Let us know if you can get the codes. With the codes if there are any we could guide you better.

All of my keys will not start truck. truck wants to start, but it is also not getting fuel to start. either my keys will not manually open doors .
We have tried taking positive off battery and putting it back on.
We tried sequence of leaving it on position for ten minutes.
We are going to try to boost the truck.
We want to leave anything that involves snipping wires as a last resort.

You do not want to snip wires. You need to scan it for codes as indicated earlier and I posted a link. If no codes remove the air duct from the air filter housing to the throttle and spray carburetor cleaner into the throttle. Crank it over to see if it starts. If it does start then check for fuel pressure. You can rent a fuel gauge from your parts store. If no fuel pressure then most likely the pump failed.

You can verify this by hitting the gas tank with a rubber mallet while someone turns the key to the crank position. Most of the time the jolt will wake the pump up and start. If pressure is ok then check for spark. If you have spark.

Here is a link that will guide you through some of these steps:

https://www.2carpros.com/articles/car-cranks-but-wont-start

Let us know if you need more information on these steps.