Well, first of all, your find syntax is incorrect (did you mean to specify ${wkDir} earlier in the command line?).
Secondly, you should use safer list variant of system:
system(qw/find . -mtime +20 -type d/,$wkDir,qw/-exec rm -rf {} ;/);
(in this case the qw// operator splits the line in a list and passes all arguments safely straight to find not invoking any shell).
Thirdly, you didn't state what did you want to do. Please read How do I post a question effectively? and XY Problem and tell us what you wanted to achieve using this command.
Sorry if my advice was wrong.
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