Riddle: What is easy to get into but hard to get out of?

A safe represents this riddle, which is about getting into something

Eyezak the Riddle Robot knows that it is easy to get into plenty of things. Do you know something that is also hard to get out of? If you think you know, see if you are right? If not, we will explain what the answer is, and why that is correct. We will also debunk several other possible answers. Read on!