my $pid = fork();
if ( $pid == 0 ) {
    # child process so do stuff here
    # usually have an exit to ensure child 
    # does not escape this if clause
  exit;
}
else {
    # parent process, waits a while
    sleep 60
    # kills child
    kill 9, $pid;
}

# parent continues on here (as will child if not killed or exited)