How to open shakers that are rusted shut?

[AllSeasons]

I have multiple sterling shakers that are rusted shut, apparently due to being packed away in storage for so long by the previous owner(s). I also want to be careful, so as not to damage them. I've applied as much force as I dared, but they haven't budged. Is there an effective and safe way to tackle these stubborn shakers? Thank you in advance.

[JLDoggett]

Have you tried soaking them in hot soapy water? Sometimes adding vinegar will help dissolve the copper salts or table salt that can prevent their being open-able.

[AG2012]

Heat them; oven temperature cannot damage silver. You can use hair drier or even open fire (jeweler torch - cautiously).
Then spray with WD - 40.
Regards

[AllSeasons]

Thank you. I've tried putting one pair of shakers in boiling hot water. That was to clean off some of the tarnish with baking soda - different story and different thread - but I think that actually loosened the top from one of the shakers. The other one I still cannot get open. So maybe I'll keep trying.