Ah, I didn't realize that Apollo wanted out. I've had that situation with 2 cats, and they are very difficult to sway.
Our current FF cat with that issue is a cat named Uhura that belongs to our son, but stayed here when he married and moved.
She slept with him under the covers, played indoors, used a litter box, etc. However, each night, she *insisted* on going out.
He held out for a long time, but she became stressed, and pretty much hysterical. One day, when he was at work, she managed to get out.
It was unhealthy, so he started letting her out, or in, when she wanted out, or back in. I didn't/don't like it, but there just wasn't a way to make her happy. She'd scratch to get out until her little paws would bleed.
So, under protest, she's no longer kept indoors.
Apple-the-dog, what a cute name! 
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