Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 1
Human-Machine Interface; Situational Awareness
ATC Issue All Types; Airspace Violation All Types; Deviation / Discrepancy - Procedural Published Material / Policy
General None Reported / Taken
Airspace Structure; Environment - Non Weather Related; Human Factors
I was working the south side sectors of the ZZZ1 area while training on finals.  There was minimal final traffic and the vast majority of the traffic was within the sectors I am certified on.  Aircraft X was a non-radar ID SFRA aircraft inbound to ZZZ2.  I forgot that ZZZ3 airspace was open at the time and did not call the traffic to ZZZ3 approach as I should have.  There was no conflicting traffic.  I should have used an additional memory aid to remind me that their approach control was open.  It also has been challenging keeping up with busier traffic on VFR days on scopes I'm not very current on given standard COVID/winter traffic levels/others training on that position.I wish we had a better memory aid system in place for ZZZ3 being open as I think this a common mistake people often make.  Maybe we can make the airspace yellow when it is open similarly to how we do with the RXXXX restricted areas?
TRACON Controller reported an airspace violation and cited not being sure if another sector was open or not open as a contributing factor.