It is very important to be calm and positive thinking that should you fall into the lockout situation.
Where duplicate key?
Each car has its duplicate key for the drivers. Many cars were driven by more than one person. If in any case, you cannot find out your car keys then you can take help from professional auto lockout service.
You can easily contact the person who has a duplicate and requests for assistance. This is the right thing to do in a situation like this.
If duplicates you are left at home, depending on the distance, as long as your car is safe you can always go home and get the keys duplicated. It may take more of your time but it certainly will not do damage to your property.
Looking for help nearby
It's less likely to happen but chances are you will meet someone who is knowledgeable or who has experienced the same situation as you do and may have some valuable input to handle the situation.
Breaking in is only an option if you are in the middle of nowhere. Although it may allow you to get in your car, you will have to spend hundreds or even thousands of dollars, depending on the damage inflicted on the door-lock. This is a no-no situation if you are in the middle of town if you do not want people nearby to call 911.