2 faults help!!

[Gav84]

2012 insignia.. just after some advise.. our insignia has 2 faults.. 1. Auto lights are staying on.. every time I get out the car I have to manually switch lights off.. they always come on when in car. Have to be so careful as it kills the battery. 2. central locking not working from key fob.. once in car I can press the button in middle which unlocks/locks all doors.. I’m guessing it could be key battery.. if so can I just replace with new battery? Or does any ring need resetting 

[Vauxhall Owners Club]

If the car hasn't had much use over lockdown then the vehicle battery could be failing, worth having it checked to eliminate this as the primary cause