Suppose, just hypothetically speaking, you live in an 85 year old house with just one full bath and one half bath.

Suppose, again hypothetically speaking, your four year old son managed to make the full bathroom door lock itself after he left the bathroom. The full bathroom has no windows, and is on the second floor. It is completely enclosed.

The lock on the full bath is a mortise lock similar to ; but there is no keyhole on the outside; the lock itself is only on the inside.

Hypothetically speaking, how do you open the door?

Hypothetically speaking, do you let the son live?