Once the new pins are in reverse the steps to reassemble the lock.
Lost key for door lock.
Take your doorknob and or deadbolt to a locksmith or hardware store that makes keys.
With lost keys you hope that you are dealing with a post lock.
Ask for the service of re keying the lock.
Insert the pins and reassemble the lock dump out the old pins insert the new key and use tweezers or small needle nose pliers to match the new colored pins to the color code on the special instruction sheet.
Post locks are the easiest to work with because you just need to loop them and pull them up to unlock your door.
Keep one side of the rope in each hand.
This will allow you to use the same doorknob hardware but makes the lost key useless in this re keyed lock.
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Stick your pick into the lock while keeping.
Turn it in the direction that you normally turn your key to open the door.
You can use shoe laces tied into a slip knot and work the thin rope between the door and the frame.
Smartkey security also allows you to re key the lock yourself in seconds leaving lost or unreturned keys obsolete.