my @Chars = '0'..'9', 'A'..'Z', 'a'..'z';

That won't work as you might expect. You'll actually need:

my @Chars = ('0'..'9', 'A'..'Z', 'a'..'z');
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Those parens aren't optional. Here's a demonstration:

$ perl -le 'my @one="0".."9","a".."z"; my @two=("0".."9","a".."z"); pr
+int @one; print @two'
0123456789
0123456789abcdefghijklmnopqrstuvwxyz
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-sauoq
"My two cents aren't worth a dime.";