Hotel guests have discovered a clever workaround for turning on lights in their rooms when they forget or lose their key card. Viral TikTok user Nia showcased this hack by using her Holland and Barrett loyalty card to activate the lights, sparking excitement and surprise among viewers. Her video has garnered over 300 comments, with many expressing gratitude for the newfound knowledge. While some users shared that they were already aware of the trick, others were amazed and noted its usefulness for keeping air conditioning running in hot climates. However, experts warn that using alternative cards can disrupt hotel sustainability efforts and potentially damage card slots, emphasizing the balance between convenience and responsible practices.