Increase the humidity in the room through the use of a humidifier. Try to raise the humidity in the room with the offending door handle to at least 40 percent.
Avoid wearing rubber-soled shoes, unless safety issues (such as working in a commercial kitchen) require them. Switch to a leather-based sole shoe, which will not conduct electricity as well.
Use an anti-static lotion on your hands and fingers to keep them moisturized; dry skin suffers a worse effect from the generated shock than moisturized skin.
Avoid wearing synthetic fibers, such as polyester, which have the ability to channel electricity better than natural fibers, such as wool or cotton.