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One of the hardest inventions how to lock a door from the inside and unlock it from the outside

XEO1-

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This is a hard one with no wireless stuff how do you lock a barn door from the inside without a lock visible from the outside and how do you unlock it without a lock visable when your on the outside of the barn………..

no windows,and a vault door…….


No other rooms

0==== something like this lever…



this is a test also for inventors only(if I remember)…….. I’ll say it tomorrow…
 
They should make out of the box tests for schools like this to really make inventors think……. And turn in your homework tomorrow I mean a inventors competition YALL sounds like a ideal…


Remember I’m closing in on 2000 posts but I really only got 1300 ideals with a few odds or evens in comments….
 
Magnetic key code by distribution of pull..
 
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