At the moment the list of lines is assigned to your @lnes variable (why do you omit the i? iShortage?), the telnet command already has returned. No need to sleep here.

The problem might be that a) there are no lines returned or b) the lines are empty and/or c) they have no newline character at the end. Try:

@lines= $port->cmd("input keyevent 66"); # added i
print "Number of lines returned: ", scalar(@lines), "\n";
print "Console Log:\n";  # added newline character
for( @lines ) {
    print ">$_<\n"
}
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