Is it below freezing when this happens? Maybe there's water in lock and it's freezing. Even if it's not below freezing, have you tried spraying some wd40 into the key hole? There's actually better stuff to squirt into the key hole...look for a product that contains graphite and try that. If below freezing, I've also seen people use a cigarette lighter to heat up there key and then insert the key, wait a few seconds for the heat to melt the ice and then try turning the key.
If your drivers side door won't open, try spraying some WD-40 into the area where the door connects with the lock inside the car. This will lubricate the lock.
passenger side behind the carpet by your foot on the right side
You have to lock the car with a key. You can't push the lock down with the door open if you have power locks. They do this so that you can't lock your keys in the car.
To take the drivers side lock out of a 1990 4runner you will first need to remove the door cover panel. Once the door cover panel is removed you will have access to the lock and can replace it.
The 2001 Chevy S 10 Blazer power door lock relay switch is located inside of the drivers side door. You will need to remove the drivers side door panel in order to access the door lock relay switch.
Remove the drivers side door panel of your Mercedes-Benz. Remove the door lock assembly retaining bolts. Remove the door lock linkage. The door lock assembly will come off.
On the drivers door armrest has the window lock switch been pressed on the left side ? If it has , then only the drivers door switches operate the power windows . Press the right side of the window lock switch
Check the side of the dash when you open your drivers side door.
inside of the drivers side door
Remove the inside door panel of your 1994 Chevy Lumina. Remove the door handle linkage. Remove the door handle retaining bolts. Reverse the process to install the new door handle.
The same way you would on the drivers side....
I think this is a safety measure to keep you from locking your keys in the car. Try locking it with the key after the door is shut.