Do you have a spare key?
Before immediately calling a locksmith, try to remember if you have an extra key hidden somewhere. If the key is not near your car, think about calling someone who can fetch it for you, or take a taxi cab to the site of your spare key.
Now might be a good time to make a mental note to make a spare key with a locksmith soon, in the case you don't have one handy.
Try your hand at breaking in to your own car
This is the least glamorous of options. If the window is slightly opened, you may be able to unlock the car with a metal coat-hanger (if your car has tapered lock buttons). In this case, you can form a small hook with the hanger and work it between the car and the door. As you move it you can attempt to catch the button and unlock it.
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