I'm not a parent and have no interest in playing one on TV. However, my view is that you probably shouldn't go straight to changing the locks on the doors but instead lay down the law on the criteria for being allowed to stay. Make the rules strict and concrete. Then, when he eventually breaks those rules, you can at least fall back on that as the reasons for doing it.
If you do it without warning, it will be seen as arbitrary. If there are rules and he breaks them, that's on him (though I fully understand he won't see it that way).
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