I have played 4 hours worth of strikes, 2 hours of Siva Crisis and 2 hours of Heroic Siva Crisis, and have only picked up a single key. The only benefit for me to do these are to open the chests at the end but with such low drop rates, it isn't really worth the time. Incredibly frustrating.
Edit: picked up my first skeleton key since October 19th. It is now November 3rd. So far i think I've picked up a total of maybe 6 keys since roi released. That includes the 3 from the quest line.
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I heard you have to pay bungie money and beg on your knees for 5-6 strikes before you get that 5% chance at best. Kidding around. Oh wait no i'm not because [spoiler] [u][b]Skeleton key drop rate is TERRIBLE[/b][/u].[/spoiler] I'm not even gonna run strikes anymore because they aren't worth it at all, thanks for the 2 blues that are the same exact light level. What a waste of time.