Canon pc1585 lens stuck and will not open - Optio Pentax Cameras

Look it up in the manual, or look at the old battery

Take it to a service centre

Stuck automatic lens cover is usually a very easy fix. A lot of times it's just a bit of gunk or dirt jamming it. Pay attention to the paper or vacuum fix. Do not recommend opening it as it is somewhat complex (tiny springs and shutters).
http://camerarepair.blogspot.com/2007/11/repair-of-stuck-lens-covers.html

I am afraid you have the notorious lens stuck problem. If you google "canon lens stuck" or "canon lens not retracing" the results will be in millions. Canon's quote for repairing this issue is well over the cost of the camera itself. However all is not lost. It may be just dust. You can try to clean the lens contacts with isopropyl alcohol and see if resolves the issue. I have previously suggested placing the camera lens on the edge of the table and hit it with moderate force to force the lens back into the slot and I was surprised to know it worked for a lot of people!
http://www.fixya.com/support/t240817-camera_error_e45
Might be worth a try after getting a quote from canon?

Try the procedures in this tip.

Put in real Kodak batteries. pull out the lens a bit. same just happened to mine

Please see the following article on automatic lens covers:

http://camerarepair.blogspot.com/2007/11/repair-of-stuck-lens-covers.html

You can refer this guide, fix it DIY
How to fix a sticky lens barrier on Canon A530

The E18 error is an error message on Canon digital cameras. The E18 error occurs when anything prevents the zoom lens from properly extending or retracting.[1] The error has become notorious in the Canon user community as it can completely disable the camera, requiring expensive repairs.
A quick internet search for "E18" + "canon" quickly reveals hundreds of similar complaints.
ConsumerAffairs.com reports that the "lens has a feature called bellows claw, which is a gear that physically extends and retracts the lens. A piece that holds the lens, the barrier plate, is not large enough and can sometimes cause the bellows claw to malfunction, resulting in a stuck lens". The result is a black screen that only contains the error message, E18. Another problem mentioned on the site blames a sticky iris in the lens, caused by grease entering inside from the microphones built into the lens. The buildup freezes up the ability of the lens to open.

lens opens about 25% . Will not close back.