You can not put PHP functions inside your shortcode.
However, you do not need to. You can just use your foreach-loop to create the html and store it in a variable, for example $shortcodehtml.
So, afterwards, you can call
echo do_shortcode('[O_U user_name="operator" blocked_message="This page is restricted for guests."]' . $shortcodehtml . '[/O_U]');
The better version of that would be if you would create the output inside the shortcode function – from my point of view it is not necessary to pass the whole html to the shortcode – but this should work fine.
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