I used a same-city errand service to send my keys to the office.
Tips
usage
同城 = 'same city,' 跑腿 = 'to run errands'. Together: intra-city on-demand pickup and drop-off, for when you forgot documents at home, need a cake urgently, or want something queued for you. Big players are 达达、闪送、美团跑腿,and 饿了么跑腿.