Locksmiths can use the key to produce a new one. Unlike the first method, locksmiths don’t have to disassemble the lock when using this method.
To do this, a locksmith will use a blank key, which is inserted and turned in the lock’s cylinder. When the lock’s pins press into the blank key, it leaves marks on the blank. Using these marks, locksmiths can use key-cutting equipment to cut a new replacement key.
However, since it relies on marks, it may take locksmiths multiple attempts to do it successfully. While the first key may work, it takes time and good key-cutting equipment to make a key that works every time.