Long Shot - trying nto remember the name of a book from Childhood

Kegs

With the Benedictine monks.
Im trying to remember a book myself, its about a young man who somehow gets transported to another world where they use fire elementals to light fires etc keep em in a box, and when he speaks english they are like words of power, there was a locked oak door and he said "open" and it exploaded!!!

Can't remeber for the life of me help!!!
 
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