I have a 2005 Ford E250. recently, when I parked Van and turn off the engine, the key was locked, need try several times to pull out the key. the thing seems getting worse and worse Why?

 

There's nothing like answering a question with another question, maybe a couple.
Do you have another key to try to determine if the one key is worn?
If so, have you tried it ?
If all the keys are difficult to work with , there is a good possibility the key tumbler assy may need to be replaced.
If that is necessary you can do one of two or three things ,
Remove the tumbler assy yourself , and install a replacement one that you can purchase at some auto supply stores ,only problem is doors will have one key and ign will be another.
Take it to a locksmith that will handle the replacement and maybe be able to keep all the keys the same,
Or , a dealership.

 

thanks, hanky. I will try what you suggested.

 

Do you think it could be the steering wheel locking?

You could try rocking the key back and forth as you turn the steering wheel.

That has fixed the issue for me before.