Yes, the car battery powers the electrical systems, including the door locks. In most modern vehicles, the door locks are controlled by electric actuators that rely on the battery for operation. If the battery is dead or has a low charge, the door locks may not function properly.
With your key in the door lock cylinder.
it locks when the car locks and on. when you turn off the key and unlock the door, the fuel door unlocks so you can open it.
change the battery ahole
Yes you can you just ignor the steps that involve the door locks.
Push all the door locks down manually and then lock the drivers door with your key if it will not stay locked when you push the lock down and shut the door.
There is a little button battery inside the key fob that sends a signal to the receiver in the car. The battery is probably dead.
door locks
unplug your negative side battery for couple hours, the car locks start out a couple times them they seem to become as if possessed, really, same time stripping the gears in your locks. but that' what I did, not a problem since
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If you have electric locks, the battery is what actually does the 'unlocking'. If the battery is dead, it obviously won't work. Many locks have a supplementary mechanical linkage to allow unlocking by turning the key in the door lock, but sometimes that mechanism is broken. Try unlocking the passenger side, as a backup plan.
Blown fuse
Car door locks can be repaired in many different places. Some places one can go for it are Manta, Tucson, Car Locksmith, etc. In addition, one can look for information about how to do it oneself.