I made the comment about leaving shoes at the door. Perhaps this is a requirement only during the winter & maybe during sloppy weather.
The refrigerators in the kitchen have compartmentalized, lockable cubicles to keep your stuff safe. When I used them you had to provide your own locks. Maybe that has changed.
Phone the Hostel if you have questions. Very friendly and helpful staff.
Get an answer from HI Lake Louise Alpine Centre staff and past guests.