First, see if you can start the car via the method in this video:

https://www.crestnissan.com/blog/2017/ap...

IF you can, you likely just have a dead battery.

https://www.youcanic.com/nissan/remote-k...

If neither of these are working you will need to either provide more specific information like make/model of the Maxima, so someone here can tell you how to further troubleshoot, or you should take it to a local dealer.