You need a ticket to enter the venue.
Last admission is at 5 pm.
Damn it! The entrance to the "Room of Certain Death" is blocked.
The location from which you enter is where you make your entrance. It has to do with things like "entrance fees" and "entrance was not permitted," etc.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.