Inconsistent closing times

Elarduspark Spar is non consistent in their trading hours and close doors before closing times as displayed. Historically, the Spar closed at 20:00 but lately their closing times have been changed to 19:45 (in order for customers in the shop to leave that staff can leave at 20:00). It has happened several times where they are closed before 19:45, the last time being last night when I arrived there at 07:40 with the doors already being closed. Can management advise at which times the doors get closed ? Its frustrating to drive there only to find the shop being closed before 19:45