How to Copy a Key
You can have a copy of your key made by visiting a hardware store, car dealership, or key kiosk. Take your key with you to a hardware store and choose a blank replacement that matches the thickness of your original key. Ask the workers to make a copy for you, which takes a few minutes to complete. If you have a car key with a transponder chip, you'll need to go to your car's dealership. You can also use a key-cutting kiosk to make a copy of common keys. Take your key to one of them and follow the onscreen directions to have a copy made.
Hold the teeth on one side of the key over an open flame until they are charred. Use a lighter or a lit candle. Move the teeth of the key back and forth over the flame. It should take around 1 or 2 minutes to blacken one side of the key. Once the key is charred on one side, set it down until it is cool to the touch. Use a pair of pliers to hold the key so you don't burn your fingers. Stick a piece of clear tape on the blackened side of the key. Cut a piece of clear tape the same length as the key. Standard sized clear tape should work for most house keys. Carefully lay it on top of the key so it doesn't crease. Press the tape firmly onto the blackened side of the key so the char transfers. The outline of the key will transfer to the sticky side of the tape. Leave a fingertip-sized bit of tape at the end of the key so it's easier to remove. Remove the tape slowly after 10 seconds. Peel the tape back, being sure that it doesn't fold or crease. The char will leave residue on the sticky side of the tape in the same shape as the key. Use rubbing alcohol to remove any residual char from the key. Place the tape on an expired credit card or plastic gift card. A standard thickness card will work best. Stick the tape so the entire imprint of the key is on the card. Make sure the tape lays flat so the shape of the teeth is not distorted. Be sure to place the tape away from any raised letters or numbers on the card otherwise it will be too thick to fit in the lock. Use a light-colored card so you can easily see the imprint of the key. Cut out the shape of the key with a pair of scissors. Carefully maneuver around the outline of the key. Be mindful around the teeth, being sure to cut directly on the outline. If the teeth are not close to the correct size, they will not be able to turn the lock. It doesn't matter how the large end of the key is shaped. As long as the teeth are cut correctly, the key should work. Hold the original key up to the one you're cutting out to compare the teeth. Turn the makeshift key slowly in the lock. Insert the key delicately into the lock so it doesn't bend or deform. Once it's fully inserted, hold the key as close to the lock as you can and turn it. It should unlock easily. Don't force the key to turn or else it may bend or break. Visit a locksmith. A locksmith will be able to make an exact replica of your key with special tools and machines. Locksmiths will also be able to work with keys that cannot be copied at other locations. Some locksmiths may be able to make copies of a key just from a picture of the original. Go to a dealership to get a copy of a car key. Many car keys have transponder chips in them so duplicates cannot be cut normally. Find a dealership with your model of car and ask about their replacement key services. Older vehicles may just need a copy of the key without a chip. Ask the dealership what is required for your specific make and model. Take your key to a hardware store if there's one close to you for convenience. Many hardware stores or big box stores offer a key-cutting service that only takes a few minutes to complete. Pick a blank replacement key in the design you want and ask the workers to make a copy. Make sure the key design you choose matches the thickness of the original key, or else it will not fit in the lock. Stop by a key-cutting kiosk for a quick experience. KeyMe is a service that places kiosks in various locations that can make a copy of a key. Common keys can be cut right at the kiosk while car keys or other specialty keys will be sent to you by mail. Find a KeyMe location on their website: https://www.key.me/ Scan the key into the phone app for ordering a spare key at home. 
Hold the teeth on one side of the key over an open flame until they are charred. Stick a piece of clear tape on the blackened side of the key. Remove the tape slowly after 10 seconds. Place the tape on an expired credit card or plastic gift card. Cut out the shape of the key with a pair of scissors. Turn the makeshift key slowly in the lock. Visit a locksmith. Go to a dealership to get a copy of a car key. Take your key to a hardware store if there's one close to you for convenience. Stop by a key-cutting kiosk for a quick experience. 