urgent need for a non-destructive extra lock

My female friend has had to move to an incredibly sketchy, SHITTY apartment in a new city. She is understandably scared, and needs extra security. But the she cannot modify the doors in a way that requires drilling and mounting hardware. Is there an external lock or barrier she can put up against the door without having to drill / destroy the apartment property?

submitted by /u/BONGwaterDOUCHE
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