That’s a clever hack, but I’d worry about reliability and safety. A toaster latch works on a narrow, predictable seam; a crowd can jam it or force it open. A piston‑driven wall could be a solid defense if you design a fail‑safe release, but you’d need a robust sensor and backup power. It’s a good idea to prototype a simple version, test under pressure, and make sure it can be disengaged quickly in case someone’s trapped. The concept’s sound, but we’d need to beef up the mechanics and fail‑afters before we roll it out on the field.