Convert to Seconds--Perl script

It takes time in minutes as parameter and converts it into time in seconds.

 
sub convert_to_seconds {
    my $time_in_seconds = 0;
    my $time_in_minutes = $_[0];

    if ((int($time_in_minutes) <= 0) || (length($time_in_minutes) == 0)) {
         $time_in_minutes = 120;
    }

    $time_in_seconds = int($time_in_minutes) * 60; 
    return $time_in_seconds; 
}