At about 1130 eastern time, a Cessna 172N was damaged when it ran off the end of the runway during an attempted take off from Everglades Airport. The pilot received minor injuries. The pilot reported that he reached an airspeed of 60 knots but could not rotate to take off. He stated what I did was that I did not remove the control lock from the yoke. The airplane overran the runway as the pilot attempted to brake to a stop.