What is Reddit's opinion of Kryptonite 998600 Black 2.6mm R4 Retractor Combination Lock Cable with LED light?
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1 review of this product found across Reddit:

Well without being able to make modifications to the doors or door frame your gonna be kind of limited. I know you said preferably no string or rope but the only way to semi secure that door is via the door handles. That said using this type of lock around the door handles may secure it as ugly as it is.

http://www.amazon.com/gp/product/B001SMPEL4?ie=UTF8&at=&force-full-site=1&ref_=aw_bottom_links

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