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To use the filing tool, locate a pair of nail clippers that has a tiny nail filing tool. Most of these tools have a curved tip at the top of the file. When you are ready to pick the lock, slide the file out from the base of the nail clippers. Move the file until it is straight, and hold the file where it meets the clippers. You can slide the nail file either clockwise or counter-clockwise. Hold the tool up to the bottom of the keyhole so the curved tip faces downward, and push the tool into the keyhole as far as it can go. The tool should easily slip inside the hole, and most of the file should go inside. Since the nail file has a slightly curved tip, it works great to get inside the filing cabinet lock. Move the file clockwise and then counter-clockwise so you can find the correct way to unlock the cabinet. When you find the correct position, the nail file easily slides that way. You'll feel the filing tool slide into place.  This may take a bit of experimentation. With a little practice, you can get the hang of it. For many filing cabinets, you can turn the nail file clockwise, like you would your key. The nail file fits almost perfectly into the keyhole. With a bit of pressure, you can easily unlock the filing cabinet. Move the filing tool up and down slightly 3-5 times. This moves the pins of the locks so you can easily open the cabinet. Most household locks have about 5 pins, and your key effortlessly moves these pins when you insert it into the lock. You must move these pins to unlock the cabinet. After you jiggle around the file to move the pins, gently spin your wrist in the direction you determined earlier. With this motion, the locking mechanism moves into the “unlocked” position. You may hear the locking mechanism collapse as you do this. After you move the keyhole into the unlocked position, take the nail file out of the lock. You can fold the file back inside of the clippers. Then, simply pull on the handle or door to open the cabinet. To lock the filing cabinet, move the nail file the opposite direction.
Use a nail clipper file with a curved tip as your lock pick. Insert the filing tool into the bottom of the keyhole. Turn the file back and forth to determine which way to unlock it. Jiggle the nail file up and down gently to release the locking mechanism. Move the nail file the correct direction to unlock the keyhole. Remove your nail file and open the cabinet.