this happened at the restaurants in the mall . When i was about a few years ago , i was at the mall with mother sister and little brother .We wanted had lunch , i was volunteer Reservation of seats. I saw glass doors that went to inside, while i was tried pull the glass doors. and it hasn’t mission.I tried about ten minute. So,then somebody walk stand beside and told to me “Can i help you??” i said “What!! oh okay” She smiled and open the doors by sensor switch. I was so embarrassed. Fortunately,my mom called to me.