Removing A Broken Car Key

Sometimes the car key gets stuck in the ignition lock or door lock of the car and when one tries to pull it back, it breaks-off in the lock itself. Now you have two options, call an expensive locksmith, or give it a try yourself. In case, you have decided to do it yourself, here are few helpful tips for you. Remember, you will need a lot of patience while doing this, as it may prove a little frustrating in some cases.
1)First of all try to pull out the broken key by spraying some lubricant into the lock. The lubricant reduces the friction between broken key and the lock to a very low level.
2)If the key doesn’t come out, place a thin hacksaw/blade into the lock with teeth positioned as per the key’s position. If your key’s groove are located at the top of the lock that insert the hacksaw with the teeth facing upwards. Conversely, if the key grooves facing downwards, than hacksaw should be inserted with teeth facing downwards. The hacksaw should be inserted on the right side of the broken key.
3) Now carefully turn the hacksaw as per the positing of the key. If key-grooves are facing upwards than turn the blade slightly to the left. Turn the hacksaw right if grooves of the key are facing down.
4) Now carefully pull the hacksaw out of the lock along with broken key. Repeat the same process till you successfully bring a small part of the key peeking out of hole.
5) Now you will be needing needle-nose pliers for grasping the broken key out of the key-hole. Keep gently pulling the broken key out till it come out completely.
6) However, if you are still not able to pull the broken key out of the hole than its better to call a local locksmith for the purpose.
7)All these steps should be followed gently as rough use of tools can cause a severe damage to the lock itself.

 source:http://www.carzy.co.in/blog/car-maintenance-tips/