How much does it cost to take out the security door key when it is broken in the lock

Find a locksmith.

If you use iron wire or something, the wire may also break inside. >>>More

After the lock cylinder is removed, the lock spring comes out.

Quzhou Qujiang District Xiaotian Lock provides Qujiang area car anti-theft door emergency unlocking, lock maintenance services.

Hold the key with pliers, rotate it to the state it was inserted in, and pull the key out.

If there is a little bit on the outside, you can clip it out with nail clippers, and if it is broken inside, you can only call the lock cylinder to be unlocked.