The locksmith will lubricate the plug with a lubricant spray like WD40 but do not use graphite. Use a long pick that ends with key like ridges to distribute the lubricant through the lock tumbler. The long picks are called a rake pick. The next step is to use a tension tool that will fit the keyway snuggly. The locksmith will start using very light tension before they turn to stronger methods. If there is too much tension it can weaken the drive springs. These are what keep the pins in place inside the lock.
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