Hey me and my friend play on PC and downloaded this game only to be stuck at the start of the game unable to to interact with items such as the window to the kitchens where you place the dockets at. We have tried different angles while pressing 'Z' and failed- I'm not sure if it's our problem or some coding in the game? Help or advice would be appreciated. :) 
I am so so so so late, the place to turn in the tickets is the golden lightswitch looking thing right next to the window to turn it in, stand in front of it, press the up arrow key, press Z, then wait for the food at the window. to pick it up, stand in front of it, press the up arrow key, and press Z again. you basically always have to press the direction of the item/thing you're interacting with otherwise it won't register it! I hope this helps if you didnt already figure it out!