Security stays on?

I have the car listed above, it won't crank and the security light is on and it stays on. It does not blink and I have tried disconnecting the negative battery wire and a few other ways I have seen on the internet with no luck. They all say that the security light should blink but mine does not, it stays on the whole time. Is if I replace the key and the key tumbler will that fix it and will it start again? I don't know what else to do, it's our only car and don't have the money to get a new car. Please if there is any way to bypass it or anything? I would be forever grateful thank you and hope to hear back soon.. Fingers crossed. Shawn fox.