Saw This on My Mayonnaise Jar...Is the Grammar Correct?

I may be over thinking this (ok, clearly I am) but it's been bothering me.

The label on my Mayonnaise jar says this:

Ok, so help me out here.  I need to know to know from all my smarty pants grammar-loving friends... 

Should it be written as "IN the door" or does "ON the door" sound better??

It's driving me nuts!

Josh

Josh

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