He found a key in his pocket that unlocked a door he had never seen before.
The key is shaped like a thunder bolt and feels very cold to touch. He uses the key to unlock the door that spawns behind him out of nowhere and a big surprise is waiting for him on the other side of the door.
After he enters the mystery door, he was astonished to see his hometown in a different state where there are many trees around the area and the houses in the town are made of wood and stones which is the total opposite of the town he knows. The door leads him decades back to the same hometown where he lives since birth and the scenery he saw brings a huge nostalgia to him since the state of the town where he spent his childhood and teenage life is very much different to the current time where there are fewer trees in the neighborhood and it is starting to get more urbanized with the continuous rise of commercial buildings in the area.
He is strolling the area for an hour and suddenly he starting to get unconscious and decided to lay down on a wooden bench he saw on the park. When he regains his consciousness, he was surprised to see himself lying down on the same wooden bench, but it is not on the park but on the bus stop where he was originally waiting to the bus ride going to the office.