Car won't start

My car won’t start but i can’t figure out why. The batteries fine because the radio works. I lost the regular key and i am using the spare. I try to turn it over, but nothing happens, no clicking or anything. Why?

year
make
model
eng,if you know that
transmission.

thanks

not sure year late 90’s in my guess
nissan
maxima
i think its a 3L
5 auto

its really my friends car he just left it in my driveway over night and dosb’t know anything about cars, i don’t know if that helps you out at all

He should find someone with a set of jumper cables to get a jump start. Something may have been left on which drained the battery. Even a weak battery will run the radio; but, it won’t start the car.

O.K. I wondered about that. Thanks I’ll try.