Small hatch door in utility room

[Robert Regier]

I'm an inspector in training and I just did an inspection (for a friend) of a condo. I came across a small hatch door in the wall of the utility room (in the inspection unit). I think it may have been the water shut-off for the unit. I didn't have the special key to open the door, so I just left it. Is this a standard set-up for water shut-offs for condominiums? Do you usually check these out? Do you always carry these kind of special keys?
Thanks Bob

[Eric Barker]

I can't think of a reason to lock an access to the main water shut off valve. The only key that I carry is for the fireplace gas valve.

[John Arnold]

Could be access for something serving another unit.

[David OKeefe]

Even without the lock, that is inaccessible due to the shelving. If it was the water shutoff it should not be behind the shelving.