The doors that I want the kids to stay inside don't have knobs, they are all those lever handles. We've tried those squeeze child locks on the knobs. Two hands, some coordination and a bit of strength is enough to turn them. My four year old opens them as quickly as I do and my 2.5 year old only takes 10 seconds or so.
For the cupboards I gave up and used a thick bungy cord wrapped betweed the handles and tied tight. My son then 2 years old at the time simply ripped the handles off of the cupboard. Anything important is now kept 5 feet or higher up.
My nephews were similar and their mom wanted to keep them in their room at night. In the end she removed the handle from the inside of the door. She kept a screw driver up high to turn the latch if she got locked in.
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