Aluminum storefront doors usually give warning before they fail. The earlier you catch these signs, the less likely a small adjustment turns into a hardware replacement or a door that cannot be locked.
Uneven gaps around the door
The reveal between the door and the frame should be even. A gap that is wider at the top on the latch side and tighter at the bottom suggests the door has dropped.
Scrape marks on the threshold or frame
Bright wear lines on the threshold, bottom rail or frame mean the door is touching something it should not.
Latch or lock troubles
If the key needs jiggling, if the door only locks when lifted, or if the latch no longer enters the strike cleanly, alignment is likely off.
Light or air at the edges
Daylight at the sides, dust on the floor inside the door and a whistling sound in wind point to worn weatherstripping or a door that no longer seats properly.
Changes in how the door feels
A door that has become heavy, swings differently or does not close the way it used to may have worn pivots, a failing closer or a bent component.
Loose or rattling parts
Loose screws, a wobbly pull handle or a door that rattles in the frame suggest fasteners have worked loose.
None of these require an emergency call, but they are worth acting on before the door starts missing its latch. An adjustment visit, with worn parts replaced as needed, costs less in disruption than waiting for a failure.