The one thing that you need to make sure you do if you have no spare keys is to call a locksmith. Most people will try to use their own methods in order to get the key taken out of the car, but they are not professionals and will typically end up breaking something without purposefully meaning to do so. The best way for you to get the car keys out of your car is to make sure you have a professional who can get in without breaking anything.
http://www.autokeygroup.co.uk/locked-keys-in-car/