Most pedals allow adjustment to how much force it takes to unclip. Bring some very small allen wrenches to class next time. Look on the pedal for a small adjustment screw and back it out as much as you can. Humorously I also had a screw come loose on my shoes once and it took me down...twice. I didn't realize what had happened the first time when my shoe wouldn't unclip. Got back on the bike, took off, tried to unclip but my shoe twisted and nothing happened. Over I went for the second time.
Between the temps, the wind and the snow I haven't been outside on my bike for the last two weeks but I have also been spinning regularly. Glad to hear you're spinning and continuing your recovery.