The Lord of the Tools 40Pcs Side Tactile Push Button Micro SMD SMT Tact Switch for Electrical Appliances Toys 2x4x3.5mm

https://www.amazon.com/Lord-Tools-Electrical-Appliances-2x4x3-5mm/dp/B0FF9HVV85 That's your part. For someone competent at soldering, it's a one-minute-fix.