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There is a bunch of books called Singularity. The one you are looking for is by William Sleator.

I have been looking for this same book for years and today I kept searching and I found it. It is called singularity. I hope you enjoy.

I found this web page looking for the same book. The boy gets trapped in the shed and with time being slower on the outside he is trapped in the shed for years but in our time it was only one night....