wilson shy dog from beginner 1 in building

Wilson. there is a shy, rescue dog in my beg 1 class who is afraid to come into the building. The owner will be bringing the dog to simply explore the building. The door will be locked and sign posted on both doors. This dog will bolt ! Do Not Open the Front or back door to the building. Knockand we will let you in when the dog is back on leash. The dog is not reactive just fearful Thanks