code: def unlock_key(key_name,
                 stash,
                 passphrase,
                 backend):
      
      stash = _get_stash(backend, stash, passphrase)
  
      try:
          click.echo('Unlocking key...')
          stash.unlock(key_name=key_name)
          click.echo('Key unlocked successfully')
      except GhostError as ex:
          sys.exit(ex)
docs: Unlock a key to allow it to be modified, deleted or purged
  
      `KEY_NAME` is the name of the key to unlock