i’d think the triggers are shot by now...
A couple of drops of red mercury will bring one right up to its full rated explosive power... /Art Bell
Triggers might be unreliable, but boost gases like Dueterium and tritium are almost certainly defunct. Those tiny nukes need the boosting to produce much of a yield. Neutron generators might be inop as well.
IIRC, small nukes like artillery shells and man portables need yearly maintenance.