If you find yourself in a situation where you need to unlock a car door without a key or tool, there are a few methods you can try.
One method is to use a coat hanger. Straighten out a wire coat hanger and create a small hook at the end. Then, insert the hook into the space between the door and the window. Once the hook is in place, move it around until you feel it catch on the locking mechanism. Once you've found the locking mechanism, jiggle the hook until the door unlocks.
Another method is to use a wedge. Wedges can be made out of anything that's thin and sturdy, like a credit card or a business card. Simply insert the wedge into the space between the door and the window and apply pressure until the door pops open.
If you have a string or a rope, you can try the string method. Loop the string around the door handle and pull it tight. Then, use a small object like a nail or a paperclip to wedge the string in place. Once the string is wedged, pull on the door handle and the door should open.
If all else fails, you can always call a locksmith. A locksmith will be able to quickly and easily unlock your car door without damaging the door or the car.