BFT Regal 5 and courtesy lights

[thm]

Lock outputs on gates usually only pulse for a set amount of seconds so this wouldn't work unless it also pulsed on close then you could use a latched relay, personally I would go with above mentioned independent switch

That's the regular operation of the lock output. However, the "suction-type" => ON option looks like intended for connecting a magnetic lock, where you keep the magnet powered to keep the gate closed. At least, this is what I think the manual describes, despite the ambiguous terms used, and a multimeter could easily prove or disprove that.