On 19 Nov, 12:53, wrote:
A friend locked herself out of her flat this weekend.
I offered to come round and use my size 11 skeleton keys on it :-) but
she called a locksmith instead.

The lock was a single yale-type lock which locks when the door is
pulled closed.
My question is - how would a locksmith open this?

I thought about drilling through the keyhole with a HSS bit - bit I
guess (hope!) the cylinder should be able to resist this type of
attack?

If it's the old-fashioned type of Yale that doesn't deadlock then you
can just slide something (bit of stiff but flexible plastic) between
the door and the frame to push the bolt back into the, errrrr
thingie.

See http://www.wikihow.com/Open-a-Door-With-a-Credit-Card

Some interesting links there!
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