Chosen Solution
My car key is not unlocking my doors and alarm goes off but the key does not work in the door to stop it. I do not have the car key button to stop it either.
Call the Nissan dealer and give them the VIN number and they can make one for you.
Buy a new car, the price of them making you a key is more than the car is worth, use the money as a down payment on a new/newer car.