The plastic inside door handle is probably broken.
Go in from another door and open it from the inside.
The linkage may have popped off or the lever on the inside handle may be broken. Remove the inside door panel and you will probably see what happened.
A person a can open the rear door from the inside. Get into the car from another door that will open and open it from the there.
You have to pull the inside door panel off. Once removed, look for the door latch mechanism and pry it with a screwdriver. This will release the door.
I suspect the rod that opens the door has come loose or broken off the door handle and is keeping the window from coming down. Take the inside door panel off and check. If needed just replace the door handle.
disconnect the battery and try to open manually from inside
The lever came loose. It needs be re-attached. I have had to do that manually and it requires going into the door.
if its a lift up handle and wont open your door most probably the rods come out of its slot inside the door
I had to jam something on the release lever inside the door, and go around and manually pull the door open. The cause is that the spring had broken. The catch was being released, but nothing was pushing the door open. I have to buy a new spring and install it once it was open
the linkages to either the handles or the lock or both has come off. here's the kicker... you need to open the door to take of the inside door pannel to fix it. try to remove the pannel with the door closed. or a "skilled" vheicle locksmith could open it from the outside...but it's not cheap.
replace the fuses for each. when you open your driver side door, there should be a door on the side of the dash that you can open, it will have a diagram with all the fuse names on it.
Use the key to open the door.