Enforcing any process or tool is pointless as long as the majority fails to understand the value of it. A process should only (try to) organize things people genuinely want to put some effort in.
Finding time for code reviews is hard enough when people agree they are useful; no surprise they're not done properly when people miss the point.
If you work in a company that does not even understand the value of code reviews then you should probably try to find a better job where quality, teamwork and personal development actually matter. Run even faster if a rigid process forces code reviews to happen anyway.