Stone_cold
Out of the speed brake inhibition conditions mentioned below in DSC-27-10-20 P 11/20 D only one is applicable in alternate law i.e. thrust lever above MCT. So just by dropping speed below Vls they will not retract unless thrust levers are advanced. Stall recovery procedure asks you to check they are retracted.
Speed brake extension is inhibited, if:
-SEC1 and SEC3 both have faults, or
-An elevator (L or R) has a fault, or
-Angle-of-attack protection is active, or
-Flaps are in configuration FULL, or
-Thrust levers above MCT position, or
-Alpha Floor activation.
If an inhibition occurs when the speed brakes are extended, they automatically retract and remain retracted until the inhibition condition disappears and the pilots reset the lever. (The speed brakes can be extended again, 10 s or more after the lever is reset).