Replace ignition key by 100,000 miles on Toyota 4Runner

Problem Description and Possible Solution
By 100,000 miles the ignition key tends to wear out and should be replaced or it may not work as well in the door locks or ignition lock cylinder.
Problem Data
RepairPal Verified
Average mileage: 137,464 (10,000–184,324)
7 model years affected: 1990, 1991, 1992, 1993, more1994, 1999, 2006
11 people reported this problem
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Engine key only sometimes will start the car, and sometimes turning it off won't stop the engine (keeps sounding like it's trying to start). Battery has been replaced and still does it.