How do I open this secret door in the first level?

How do I open this secret door in the first level? - Photo of Woman Behind Door

This is an older DOS game I use to play as a kid. I've purchased the Apogee Throwback pack on Steam which included this game.

In the very beginning of the first level, there is a secret wall behind you where you start. You can see that in the screenshot below (the wall has already been pushed open):

Secret Wall

If you proceed down the hallway beyond this secret wall, there is a locked door.

Locked Door

As you can see, if you attempt to open it, it says "This Door Appears to be locked." How do I open it? I've never done this as a kid and I've always wondered what was behind that door.






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Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Adrienn, Gift Habeshaw, Leyla Kılıç, Dayvison de Oliveira Silva