How to match the key to unlock without a key?

For locks without keys, the key matching process is as follows: first, fix the lock core or lock head and unlock it by technical unlocking. After the lock core rotates, remove the fixed clamp spring of the lock core, slowly remove the sleeve core, small spring and upper and lower pins in the center of the lock core, arrange all the springs and upper and lower pins on the table, read out the tooth difference, and match the key blank on the key machine.