Hash Perl

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#!/usr/bin/perl
use strict;
use warnings;
use Hash::Util qw(lock_keys unlock_keys lock_hash unlock_hash lock_value unlock_value);
my %hash1=(one =>'first', two=>'second', three=>'third');
lock_keys(%hash1);                   
unlock_keys(%hash1);                 
my %hash2;
lock_keys(%hash2,'one','two','six'); 
lock_value(%hash2,'one');            
lock_value(%hash2,'two');            
unlock_value(%hash2,'two');