open quickfix windows after csope and jump

I have the following function

1 function! CscopeFind(action, word)
2 try
3 exe ':cs f '.a:action.' '.a:word
4 exe ':copen<cr>'
5 catch
6 echohl WarningMsg | echo 'Can not find '.a:word.' with querytype as '.a:action.'.' | echohl None
7 endtry
8 endfunction

The idea is open quickfix window and jump to the given result. I finally realized that I cannot do

exe ':copen<cr>'

because of a <cr>

I can't really figure out how to implement this. Does anybody have any idea?

Any help is appreciated.

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