This is the first project I've posted, so if you have any suggestions or questions please don't hesitate to let me know.
I am one of those people who can never seem to remember where they put their keys. One day I decided to fix this once and for all. The lock scans from a mifare card reader/writer mounted on the outside of the door, UIDs are read and compared to a list of approved UIDs stored on the arduino's EEPROM. If the card is approved it toggles the lock position via a servo. Can't get much simpler than this.