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 hasnt 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.