So cute! I also give Uni time out's. Same thing, it's in places she can easily get out of, not locked in, but it's the point of telling her that she needs to chillax for a few minutes.
One time she got a time out in a cubby hole (shelving system). I put a blanket over her. Time out was supposed to be 5 mins but I got distracted and forgot about her! About ten minutes go by, and I hear her start to growl. She started to get mad that I didn't lt her out but still she stayed. LOL Oops