I have a L301 compact. it says on rear screen, card locked. what do i do.

If they're on a memory card, format the memory card. If they're in internal memory, format the internal memory. See page 49 of the manual: http://downloadcenter.samsung.com/content/UM/200904/20090429105911562/L301_English.pdf

Set the camera to the manual exposure mode by turning the mode dial to "M". Change the aperture by pressing cursor-up/down. See page 19 of this manual.

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my camera samsung L301 lens stuck when swicting on

It's unusual that an A95 would report "card locked" as it uses a compact flash card which is incapable of being locked. Please verify the model of your camera, and the card that it uses.
In the mean time, I'll assume that actually own a different camera that uses SD cards. If so, please see this link for troubleshooting tips for SD card locked problems.
But if you indeed own an A95 with compact flash, the problem may possibly be caused by bent flash card pins inside the camera card slot (take a look inside using a flashlight). If bent pins are found, then see this link for a possible home fix.

Yes..it will work.

Formatting is erasing the memory card and preparing it to take new photos. If you haven't saved the photos to your computer yet, you will need to find a memory card utility that "rescues" data (pictures, in this case) from a card. You can go to your card manufacturers (Kingston, Sandisk, or whatever your brand is) website and find a suggestion for what utility they suggest.

If you had them saved to your computer, no worries, just start taking pictures again!

I think L301 is an inductor coil supplying B+ voltage to the vertical output IC, also a diode and resistor are associated with this circuit. Most likely the vertical IC has shorted causing L301 to open up. The diode could also be shorted. Stargazer