Five Nights at Freddy's: Locked Within

Plot
The year is 1999, Fazbear Entertainment closed down all of their venues and filed for bankruptcy. But, a young entrepreneur, named Andrew Higgins, decides to buy one of the venues in hopes of starting off his life fresh out of college well. About 2 months later, the Venue opens under the name Freddy's Party-Time Pizzeria. He uses the old animatronics that were there and revamps them into a Party-Time theme. In the first few weeks after the grand opening of this new establishment, business is booming. Weeks are booked for parties, money in rolling in quickly, everything seems to be going great for Andrew. But, on October 13th, 1999, a special party is booked for Andrew's son, Stephan. Stephan invites a few of his friends to come to his party. Everything goes as usual during Stephan's party. Pizza, cake, singing and dancing, all the ususal things. But, Stephan decides to feed one of the animatronics a peace of his ice cream cake. He scraps the big slice of cake right into one of the animatronics, Party-Time Freddy's, mouth. Party-Time Freddy begins to malfunction and falls over face first right onto Stephan. PTF's mouth is now wrapped around Stephan's head. Andrew panics as he goes to pull PTF away from Stephan, and other employees come to the rescue as well. But, PTF then clamps down on the next of Stephan, which causes him to scream while choking. Andrew and other employees quickly open up PTF's mouth and pulls him off of Stephan. Stephan's neck is bruised up and bleeding a bit. Stephan begins to cry loudly as Andrew rushes him to the hospital. The doctors tell Andrew to leave Stephan at the hospital to recover. Andrew agrees and leaves Stephan in the doctor's room. When Andrew returns to the pizzeria, all the lights are off, and nobody appears to be inside. Andrew assumes his wife and his son's friends had all gone home after the incident. Andrew then notices the door was left unlocked, even though the security guards should be inside. He goes inside and tried to turn on the light, but the lights blow out. Then, he sees a security guard's flashlight is on the ground. He picks it up, turns it on and sees that PTF is sitting at the table where Stephan was, staring at him with cake drooling out of his mouth. Andrew panics as he tries to rush out, but is locked inside. The doors must've locked when he close them, but how? He tries to call for help, but his phone is dead. He then decides to hide in his office behind his desk. This is where the game begins.